Document:

Exhibit 4.1

 

NUMBER OF UNITS

U-           

 

SEE REVERSE FOR CERTAIN DEFINITIONS

 

CUSIP [_________]

 

ACROPOLIS INFRASTRUCTURE ACQUISITION CORP.

 

UNITS CONSISTING OF ONE SHARE OF CLASS A
COMMON STOCK AND

ONE-THIRD OF ONE REDEEMABLE WARRANT, EACH WHOLE WARRANT ENTITLING THE HOLDER TO PURCHASE ONE SHARE OF

CLASS A COMMON STOCK

 

THIS CERTIFIES THAT is the owner of Units.

 

Each Unit (“Unit”) consists
of one (1) share of Class A common stock, par value $0.0001 per share (“Common Stock”), of Acropolis Infrastructure
Acquisition Corp., a Delaware corporation (the “Company”), and one-third (1/3) of one redeemable warrant (each whole
warrant, a “Warrant”). Each whole Warrant entitles the holder to purchase one (1) share (subject to adjustment)
of Common Stock for $11.50 per share (subject to adjustment). Only whole Warrants are exercisable. Each whole Warrant will become exercisable
on the later of (i) thirty (30) days after the Company’s completion of a merger, consolidation, capital stock exchange, asset
acquisition, stock purchase, reorganization or other similar business combination with one or more businesses or entities (each, a “Business
Combination”), or (ii) twelve (12) months from the closing of the Company’s initial public offering, and will expire
unless exercised before 5:00 p.m., New York City Time, on the date that is five (5) years after the date on which the Company completes
its initial Business Combination, or earlier upon redemption or liquidation (the “Expiration Date”). The Common Stock
and Warrants comprising the Units represented by this certificate are not transferable separately prior to [_], 2021, unless [CS][Representative]
elects to allow earlier separate trading, subject to the Company’s filing of a Current Report on Form 8-K with the Securities
and Exchange Commission containing an audited balance sheet reflecting the Company’s receipt of the gross proceeds of the Company’s
initial public offering and issuing a press release announcing when separate trading will begin. No fractional Warrants will be issued
upon separation of the Units and only whole Warrants will trade. The terms of the Warrants are governed by a Warrant Agreement, dated
as of [__], 2021, between the Company and Continental Stock Transfer & Trust Company, as Warrant Agent, and are subject to the
terms and provisions contained therein, all of which terms and provisions the holder of this certificate consents to by acceptance hereof.
Copies of the Warrant Agreement are on file at the office of the Warrant Agent at One State Street, 30th Floor, New York,
New York 10014, and are available to any Warrant holder on written request and without cost.

 

Upon the consummation of the Company’s initial
Business Combination, the Units represented by this certificate will automatically separate into the shares of Common Stocks and Warrants
comprising such Units.

 

This certificate is not valid unless countersigned
by the Transfer Agent and registered by the Registrar of the Company.

 

This certificate shall be governed by and construed
in accordance with the internal laws of the State of New York.

 

Witness the facsimile signature of its duly authorized officers.

 

	Secretary	 	 	Chief Executive Officer

 

    

     

    

ACROPOLIS INFRASTRUCTURE ACQUISITION CORP.

 

The Company will furnish without charge to each
unitholder who so requests, a statement of the powers, designations, preferences and relative, participating, optional or other special
rights of each class of stock or series thereof of the Company and the qualifications, limitations, or restrictions of such preferences
and/or rights.

 

The following abbreviations, when used in the
inscription on the face of this certificate, shall be construed as though they were written out in full according to applicable laws
or regulations:

 

	TEN COM	—	as tenants in common	UNIF GIFT MIN ACT —	 	Custodian
	 	 	 	 	 	 	 
	TEN ENT	—	as tenants by the entireties	 	 	(Cust)	(Minor)
	 	 	 	 	 	 
	JT TEN	—	as joint tenants with right of survivorship and not as tenants in common	 	 	

    under Uniform Gifts to Minors Act

    (State)

 

Additional abbreviations may also be used though
not in the above list.

 

For value received, hereby sell, assign and transfer unto

 

PLEASE INSERT SOCIAL SECURITY OR

OTHER

IDENTIFYING NUMBER OF ASSIGNEE

 

(PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING
ZIP CODE, OF ASSIGNEE)

 

Units represented by the within Certificate, and do hereby irrevocably
constitute and appoint

 

Attorney to transfer the said Units on the books of the within named
Company with full power of substitution in the premises.

 

	Dated	 
	 
	 	Notice: The signature to this assignment must correspond with the name
    as written upon the face of the certificate in every particular, without alteration or enlargement or any change whatever.
	 
	Signature(s) Guaranteed:	 
	 
	THE SIGNATURE(S) MUST BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND
CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM, PURSUANT TO S.E.C. RULE 17Ad-15 (OR ANY SUCCESSOR
RULE).	 

 

    2

     

    

In each case, as more fully described in the Company’s final
prospectus dated [_], 2021, the holder(s) of the Company’s Common Stock shall be entitled to receive a pro-rata portion of
certain funds held in the trust account established in connection with the Company’s initial public offering only in the event
that (i) the Company redeems the shares of Common Stock sold in its initial public offering and liquidates because it does not consummate
an initial business combination by [_], 2023 (or such later date if such period is extended pursuant to the Company’s Certificate
of Incorporation as in effect at such time), (ii) the Company redeems the shares of Common Stock in connection with an initial business
combination (including the release of funds to pay any amounts due to any public stockholders who properly exercise their redemption
rights in connection therewith), (iii) the Company redeems the shares of Common Stock sold in its initial public offering in connection
with a stockholder vote to approve an amendment to the Company’s amended and restated certificate of incorporation that would affect
the substance or timing of the Company’s obligation to redeem 100% of the Common Stock if it does not consummate an initial business
combination by[_], 2023 (or such later date, if such period is extended pursuant to the Company’s Certificate of Incorporation
as in effect at such time); or (iv) if the holder(s) seek(s) to redeem for cash his, her or its respective shares of Common
Stock in connection with a tender offer (or proxy solicitation, solely in the event the Company seeks stockholder approval of the proposed
initial business combination) setting forth the details of a proposed initial business combination. In no other circumstances shall the
holder(s) have any right or interest of any kind in or to the trust account.

 

    3Exhibit 4.3

 

[Form of Warrant Certificate]

 

[FACE]

 

Number

 

Warrants

THIS WARRANT SHALL BE NULL AND VOID IF NOT
EXERCISED PRIOR 

TO THE EXPIRATION OF THE EXERCISE PERIOD PROVIDED FOR

IN THE WARRANT AGREEMENT DESCRIBED BELOW

ACROPOLIS INFRASTRUCTURE ACQUISITION CORP.

Incorporated Under the Laws of the State of
Delaware

 

CUSIP

 

Warrant Certificate

 

This Warrant
Certificate certifies that              ,
or registered assigns, is the registered holder of warrant(s) evidenced hereby (the “Warrants” and each,
a “Warrant”) to purchase shares of Class A common stock, $0.0001 par value per share (“Common
Stock”), of Acropolis Infrastructure Acquisition Corp., a Delaware corporation (the “Company”).
Each whole Warrant entitles the holder, upon exercise during the period set forth in the Warrant Agreement referred to below, to receive
from the Company that number of fully paid and non-assessable shares of Common Stock as set forth below, at the exercise price (the “Warrant
Price”) as determined pursuant to the Warrant Agreement, payable in lawful money of the United States of America upon surrender
of this Warrant Certificate and payment of the Warrant Price (or through “cashless exercise” as provided for
in the Warrant Agreement) at the office or agency of the Warrant Agent referred to below, subject to the conditions set forth herein and
in the Warrant Agreement. Defined terms used in this Warrant Certificate but not defined herein shall have the meanings given to them
in the Warrant Agreement.

 

Each whole Warrant is initially exercisable for
one fully paid and non-assessable share of Common Stock. No fractional shares will be issued upon exercise of any Warrant. If, upon the
exercise of Warrants, a holder would be entitled to receive a fractional interest in a share of Common Stock, the Company will, upon exercise,
round down to the nearest whole number of the number of shares of Common Stock to be issued to the holder of the Warrant. The number of
shares of Common Stock issuable upon exercise of the Warrants is subject to adjustment upon the occurrence of certain events as set forth
in the Warrant Agreement.

 

The initial Warrant Price per share of Common Stock
for any Warrant is equal to $11.50 per share. The Warrant Price is subject to adjustment upon the occurrence of certain events as set
forth in the Warrant Agreement.

 

Subject to the conditions set forth in the Warrant
Agreement, the Warrants may be exercised only during the Exercise Period and to the extent not exercised by the end of such Exercise Period,
such Warrants shall become null and void. The Warrants may be redeemed, subject to certain conditions, as set forth in the Warrant Agreement.

 

    

     

    

 

Reference is hereby made to the further provisions
of this Warrant Certificate set forth on the reverse hereof and such further provisions shall for all purposes have the same effect as
though fully set forth at this place.

 

This Warrant Certificate shall not be valid unless
countersigned by the Warrant Agent, as such term is used in the Warrant Agreement.

 

This Warrant Certificate shall be governed by and
construed in accordance with the internal laws of the State of New York, without regard to conflicts of laws principles thereof.

 

	 	ACROPOLIS INFRASTRUCTURE ACQUISITION CORP.
	 	By:	 
	 	 	Name:	James Crossen
	 	 	Title:	Chief Financial Officer, Chief Accounting Officer and Secretary
	 	 	 	 
	 	CONTINENTAL STOCK TRANSFER & TRUST COMPANY, as Warrant Agent
	 	By:	 
	 	 	Name:	 
	 	 	Title:	 

 

    

     

    

 

[Form of Warrant Certificate]

 

[Reverse]

 

The Warrants evidenced by this Warrant
Certificate are part of a duly authorized issue of Warrants entitling the holder on exercise to receive shares of Common Stock and
are issued or to be issued pursuant to a Warrant Agreement dated as of [__], 202[_] (the “Warrant
Agreement”), duly executed and delivered by the Company to Continental Stock Transfer & Trust Company, a New
York limited purpose trust company, as warrant agent (or successor warrant agent) (collectively, the “Warrant
Agent”), which Warrant Agreement is hereby incorporated by reference in and made a part of this instrument and is
hereby referred to for a description of the rights, limitation of rights, obligations, duties and immunities thereunder of the
Warrant Agent, the Company and the holders (the words “holders” or “holder”
meaning the Registered Holders or Registered Holder, respectively) of the Warrants. A copy of the Warrant Agreement may be obtained
by the holder hereof upon written request to the Company. Defined terms used in this Warrant Certificate but not defined herein
shall have the meanings given to them in the Warrant Agreement.

 

Warrants may be exercised at any time during the
Exercise Period set forth in the Warrant Agreement. The holder of Warrants evidenced by this Warrant Certificate may exercise them by
surrendering this Warrant Certificate, with the form of election to purchase set forth hereon properly completed and executed, together
with payment of the Warrant Price as specified in the Warrant Agreement (or through “cashless exercise” as provided
for in the Warrant Agreement) at the principal corporate trust office of the Warrant Agent. In the event that upon any exercise of Warrants
evidenced hereby the number of Warrants exercised shall be less than the total number of Warrants evidenced hereby, there shall be issued
to the holder hereof or his, her or its assignee, a new Warrant Certificate evidencing the number of Warrants not exercised.

 

Notwithstanding anything else in this Warrant Certificate
or the Warrant Agreement, no Warrant may be exercised unless at the time of exercise (i) a registration statement covering the shares
of Common Stock to be issued upon exercise is effective under the Securities Act and (ii) a prospectus thereunder relating to the
shares of Common Stock is current, except through “cashless exercise” as provided for in the Warrant Agreement.

 

The Warrant Agreement provides that upon the occurrence
of certain events the number of shares of Common Stock issuable upon exercise of the Warrants and the Warrant Price set forth on the face
hereof may, subject to certain conditions, be adjusted. If, upon exercise of a Warrant, the holder thereof would be entitled to receive
a fractional interest in Common Stock, the Company shall, upon exercise, round down to the nearest whole number of shares of Common Stock
to be issued to the holder of the Warrant.

 

Warrant Certificates, when surrendered at the principal
corporate trust office of the Warrant Agent by the Registered Holder thereof in person or by legal representative or attorney duly authorized
in writing, may be exchanged, in the manner and subject to the limitations provided in the Warrant Agreement, but without payment of any
service charge, for another Warrant Certificate or Warrant Certificates of like tenor evidencing in the aggregate a like number of Warrants.

 

    

     

    

 

Upon due presentation for registration of transfer
of this Warrant Certificate at the office of the Warrant Agent a new Warrant Certificate or Warrant Certificates of like tenor and evidencing
in the aggregate a like number of Warrants shall be issued to the transferee(s) in exchange for this Warrant Certificate, subject
to the limitations provided in the Warrant Agreement, without charge except for any tax or other governmental charge imposed in connection
therewith.

 

The Company and the Warrant Agent may deem and
treat the Registered Holder(s) hereof as the absolute owner(s) of this Warrant Certificate (notwithstanding any notation of
ownership or other writing hereon made by anyone), for the purpose of any exercise hereof, of any distribution to the holder(s) hereof,
and for all other purposes, and neither the Company nor the Warrant Agent shall be affected by any notice to the contrary. Neither the
Warrants nor this Warrant Certificate entitles any holder hereof to any rights of a stockholder of the Company.

 

    

     

    

 

Election to Purchase

 

(To Be Executed Upon Exercise of Warrant)

 

The undersigned hereby
irrevocably elects to exercise the right, represented by this Warrant Certificate, to receive          shares
of Common Stock and herewith tenders payment for such shares of Common Stock to the order of Acropolis Infrastructure Acquisition Corp.
(the “Company”) in the amount of $          in
accordance with the terms hereof. The undersigned requests that a certificate for such shares of Common Stock be registered in the name
of     , whose address is          and
that such shares of Common Stock be delivered to          whose
address is          . If said number of
shares of Common Stock is less than all of the shares of Common Stock purchasable hereunder, the undersigned requests that a new Warrant
Certificate representing the remaining balance of such shares of Common Stock be registered in the name of          ,
whose address is          and that such
Warrant Certificate be delivered to          ,
whose address is          .

 

In the event that the Warrant is to be exercised
on a “cashless” basis pursuant to subsection 3.3.1(b) of the Warrant Agreement, the number of shares
of Common Stock that this Warrant is exercisable for shall be determined in accordance with subsection 3.3.1(b) of the Warrant
Agreement.

 

In the event that the Warrant is to be exercised
on a “cashless” basis pursuant to Section 7.4 of the Warrant Agreement, the number of shares of
Common Stock that this Warrant is exercisable for shall be determined in accordance with Section 7.4 of the Warrant Agreement.

 

In the event that
the Warrant may be exercised, to the extent allowed by the Warrant Agreement, through cashless exercise (i) the number of shares
of Common Stock that this Warrant is exercisable for would be determined in accordance with the relevant section of the Warrant Agreement
which allows for such cashless exercise and (ii) the holder hereof shall complete the following: The undersigned hereby irrevocably
elects to exercise the right, represented by this Warrant Certificate, through the cashless exercise provisions of the Warrant Agreement,
to receive shares of Common Stock. If said number of shares of Common Stock is less than all of the shares of Common Stock purchasable
hereunder (after giving effect to the cashless exercise), the undersigned requests that a new Warrant Certificate representing the remaining
balance of such shares of Common Stock be registered in the name of          ,
whose address is          and that such
Warrant Certificate be delivered to          ,
whose address is          .

 

[Signature Page follows]

 

    

     

    

 

Date:              , 20[_]

 

	 	 
	 	(Signature)
	 	 
	 	 
	 	 
	 	 
	 	(Address)
	 	 
	 	 
	 	(Tax Identification Number)

 

Signature Guaranteed:

 

THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN ELIGIBLE GUARANTOR
INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION
PROGRAM, PURSUANT TO SECURITIES AND EXCHANGE COMMISSION RULE 17Ad-15 (OR ANY SUCCESSOR RULE) UNDER THE SECURITIES EXCHANGE ACT OF 1934,
AS AMENDED).

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