EXHIBIT 4.1


 


NUMBER UNITS

U-


 


[Form of Unit Certificate]


 


SEE REVERSE FOR CERTAIN
DEFINITIONS


CUSIP [       ]


 


NABORS ENERGY TRANSITION CORP.


 


UNITS CONSISTING OF ONE SHARE OF CLASS A COMMON
STOCK AND ONE-THIRD OF ONE REDEEMABLE WARRANT 

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 Nabors
Energy Transition Corp., a Delaware corporation (the “Company”), and one-third of one redeemable warrant
(each whole warrant, a “Warrant”). Each 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 Warrant will
become exercisable thirty (30) days after the Company’s completion of a merger, capital stock exchange, asset acquisition,
stock purchase, reorganization or other similar business combination with one or more businesses or entities (each a
 “Business Combination”) 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 Citigroup Global Markets Inc. 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 offering and issuing a press
release announcing when separate trading will begin. No fractional warrants will be issued upon separation of the Units. 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 1 State Street, 30th Floor, New York, New York 10004, and are available to any Warrant holder on written
request and without cost.


 


Upon the consummation of a Business Combination,
the Units represented by this certificate will automatically separate into the shares of Class A Common Stock and Warrants comprising
such Units.


 


This certificate is not valid unless countersigned
by the Transfer Agent and 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.


 


	 	 	 
	Chief Executive Officer	 	Secretary



 






     


     


    

 


Nabors Energy Transition 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 RULE 17Ad-15 (OR ANY SUCCESSOR RULE)) UNDER THE
SECURITIES EXCHANGE ACT OF 1934, AS AMENDED.	 



 






     


     


    

 


In each case, as more fully described in the Company’s
final prospectus dated                             , 2021, the holder(s) of this certificate 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 Class A common stock sold in its initial public offering and liquidates because it does not consummate an initial
Business Combination within the period of time set forth in the Company’s amended and restated certificate of incorporation, as
may be amended from time to time, (ii) the Company redeems the shares of Class A 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 (A) in a manner
that would affect the substance or timing of the Company’s obligation to redeem 100% of the Class A common stock if it does not
consummate an initial Business Combination within the time period set forth therein or (B) with respect to any other material provision
relating to the rights of holders of Class A common stock or pre-initial Business Combination activity, or (iii) if the holder(s) seek(s)
to redeem for cash his, her or its respective shares of Class A 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.