# List of acronyms: Y

This list contains acronyms, initialisms, and pseudo-blends that begin with the letter Y.
For the purposes of this list:
* acronym = an abbreviation pronounced as if it were a word, e.g., SARS = severe acute respiratory syndrome, pronounced to rhyme with cars
* initialism = an abbreviation pronounced wholly or partly using the names of its constituent letters, e.g., CD = compact disc, pronounced cee dee
* pseudo-blend = an abbreviation whose extra or omitted letters mean that it cannot stand as a true acronym, initialism, or portmanteau (a word formed by combining two or more words).
    (a) = acronym, e.g.: SARS – (a) severe acute respiratory syndrome
    (i) = initialism, e.g.: CD – (i) compact disc
    (p) = pseudo-blend, e.g.: UNIFEM – (p) United Nations Development Fund for Women
    (s) = symbol (none of the above, representing and pronounced as something else; for example: MHz – megahertz)
Some terms are spoken as either acronym or initialism, e.g., VoIP, pronounced both as voyp and V-O-I-P.
(Main list of acronyms)

## Contents

* Top
* Y0–9 YA YB YC YD YE YF YG YH YI YJ YK YL YM YN YO YP YQ YR YS YT YU YV YW YX YY YZ
* y – (s) Yocto-
* Y – (s) Yotta – Yttrium

## Y0–9

* Y2K – (i) Year Two Thousand

## YA

* yA – (s) Yoctoampere
* Ya – (s) Yottayear
* YA
** (s) Yottaampere
** (i) Young Adult
* YAC – (a/i) Youth-Adult Committee
* YAFLA – (a) Yet Another Five Letter Abbreviation
* YAP – (a) Young Aspiring Professional
* YaBPr – (a) Yet another Brother Pat rant
* YABSLAG – (a) Yet another boy singing like a girl

## YB

* Yb – (s) Ytterbium
* YB – (i) Youcef Benzouada (Southern Algerian name)

## YC

* yC – (s) Yoctocoulomb
* YC – (s) Yottacoulomb

## YD

* YD – (s) People's Democratic Republic of Yemen (ISO 3166 digram, obsolete 1990)
* YDS – (i) Yosemite Decimal System (climbing)

## YE

* YE – (s) Yemen (ISO 3166 digram)
* YEM – (s) Yemen (ISO 3166 trigram) – Manitowaning/Manitoulin East Municipal Airport IATA airport code
* YER – (s) Yemeni rial (ISO 4217 currency code)

## YF

* yF – (s) Yoctofarad
* YF – (s) Yottafarad

## YG

* yg – (s) Yoctogram
* Yg – (s) Yottagram
* YGM – You've got mail
* Ygo – (i) Yu-Gi-Oh!
* YGCO – (i) Yamaneko Group of Comet Observers

## YH

* yH – (s) Yoctohenry
* YH – (s) Yottahenry
* YHS – Ya Hoor sur!
* YHBT – (i) You Have Been Trolled
* YHIH1 – (a) You Heard It Here First (lowercase: yhih1, pronounced yi-hi)
* YHII – You Have It Inside

## YI

* yi – (s) Yiddish language (ISO 639-1 code)
* Yi – (s) Yobi
* YI – (s) Serbia and Montenegro (deprecated FIPS 10-4 country code, now RB (Serbia) and MJ (Montenegro))
* yid – (s) Yiddish language (ISO 639-2 code)
* YIH – (a) Yiff In Hell
* YILP – (a) Youth Integration Livelihood Improvement Project
* Yippie – (p) Youth International Party + suffix

## YJ

* yJ – (s) Yoctojoule
* YJ – (s) Yottajoule

## YK

* yK – (s) Yoctokelvin
* YK – (s) Yottakelvin
* YKYFCW – You know you're from Christchurch when (post-earthquake joke)

## YL

* yL – (s) Yoctolitre
* YL – (s) Yottalitre

## YM

* ym – (s) Yoctometre
* Ym – (s) Yottametre
* YM – (s) Yemen (FIPS 10-4 country code) – (i) Your Magazine (originally Young Miss, later Young & Modern)
* YMCA – (i) Young Men's Christian Association
* YMD – (s) People's Democratic Republic of Yemen (ISO 3166 trigram, obsolete 1990)
* YMMD – (i) You Make My Day
* YMMV – (i) Your Mileage May Vary (adapted from the EPA's automobile mileage estimates, where it is used to convey the original meaning, "results may vary"); but (now) when used as an idiom, it -- (either the acronym "YMMV" or the 4 words) -- can instead mean (this e.g. comes from wikt:your mileage may vary#Phrase:) "this is just my opinion, your opinion may be different".

## YN

* yN – (s) Yoctonewton
* YN – (s) Yottanewton
* YNWA – reference to Liverpool F.C.'s sports anthem, the 1945 show tune You'll Never Walk Alone

## YO

* yo – (s) Yoruba language (ISO 639-1 code)
* YO – (s) former Yugoslavia (NATO country code, obsolete 1993)
* YOLO – (a) You Only Live Once
* yor – (s) Yoruba language (ISO 639-2 code)

## YP

* YPA – (i) Yards per Pass Attempt (football statistic)
* YPG – (i) Yekîneyên Parastina Gel (Kurdish, "People's Protection Units" or "People's Defense Units")
* YPIO – (a) Your Problem Is Obvious
* YPO – (a) Young Presidents' Organization

## YR

* YRR – (i) "Young, Restless, and Reformed", an alternative name for the New Calvinist movement

## YS

* ys – (s) Yoctosecond
* yS – (s) Yoctosiemens
* Ys – (s) Yottasecond
* YS – (s) Yottasiemens
* YSA
** (i) Young Single Adult, a designation used by the LDS Church for single adults under 30
** Young Socialist Alliance
** Youth Service America

## YT

* yT – (s) Yoctotesla
* YT
** (s) Mayotte (ISO 3166 digram)
** Yottatesla
** Yukon Territory (postal symbol)
* YTD – (i) Year-To-Date
* YTM – (i) Yield to Maturity
* YTS – (i) Youth Training Scheme
* YTT – Yoshi Topsy-Turvy
* YT – YouTube

## YU

* YU
** (i) York University
** (s) former Yugoslavia (ISO 3166 digram, obsolete 2003)
* YUG – (s) former Yugoslavia (ISO 3166 trigram, obsolete 2003)
* Yuppie – (p) Young Urban Professional + suffix

## YV

* yV – (s) Yoctovolt
* YV – (s) Yottavolt

## YW

* yW – (s) Yoctowatt
* YW – (s) Yottawatt
* YWCA – (i) Young Women's Christian Association
* YWMV – (i) Your Wallet May Vary (to convey "our budgets are different as far as what is affordable / justifiable")

## YY

* YYH
** (i) YuYu Hakusho
** (s) Taloyoak Airport, IATA airport code
* YYK – (i) Yeah you know