(Main list of acronyms)

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  • 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

YZ