List of acronyms: Y

(Main list of acronyms)


 * 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 your mileage may vary:) "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