List of acronyms: Y
(Main list of acronyms)
Y0–9
- Y2K – Year Two Thousand
YA
- yA – Yoctoampere
- Ya – Yottayear
- YA
- * Yottaampere
- * Young Adult
- YAC – Youth-Adult Committee
- YAFLA – Yet Another Five Letter Abbreviation
- YAP – Young Aspiring Professional
- YaBPr – Yet another Brother Pat rant
- YABSLAG – Yet another boy singing like a girl
YB
YC
- yC – Yoctocoulomb
- YC – Yottacoulomb
YD
YE
- YE – Yemen
- YEM – Yemen – Manitowaning/Manitoulin East Municipal Airport IATA airport code
- YER – Yemeni rial
YF
- yF – Yoctofarad
- YF – Yottafarad
YG
- yg – Yoctogram
- Yg – Yottagram
- YGM – You've got mail
- Ygo – Yu-Gi-Oh!
- YGCO – Yamaneko Group of Comet Observers
YH
- yH – Yoctohenry
- YH – Yottahenry
- YHS – Ya Hoor sur!
- YHBT – You Have Been Trolled
- YHIH1 – You Heard It Here First
- YHII – You Have It Inside
YI
- yi – Yiddish language
- Yi – Yobi
- YI – Serbia and Montenegro and MJ )
- yid – Yiddish language
- YIH – Yiff In Hell
- YILP – Youth Integration Livelihood Improvement Project
- Yippie – Youth International Party + suffix
YJ
- yJ – Yoctojoule
- YJ – Yottajoule
YK
- yK – Yoctokelvin
- YK – Yottakelvin
- YKYFCW – You know you're from Christchurch when
YL
- yL – Yoctolitre
- YL – Yottalitre
YM
- ym – Yoctometre
- Ym – Yottametre
- YM – Yemen – Your Magazine
- YMCA – Young Men's Christian Association
- YMD – People's Democratic Republic of Yemen
- YMMD – You Make My Day
- YMMV – Your Mileage May Vary ; but when used as an idiom, it -- -- can instead mean "this is just my opinion, your opinion may be different".
YN
- yN – Yoctonewton
- YN – Yottanewton
- YNWA – reference to Liverpool F.C.'s sports anthem, the 1945 show tune ''You'll Never Walk Alone''
YO
- yo – Yoruba language
- YO – former Yugoslavia
- YOLO – You Only Live Once
- yor – Yoruba language
YP
- YPA – Yards per Pass Attempt
- YPG – Yekîneyên Parastina Gel
- YPIO – Your Problem Is Obvious
- YPO – Young Presidents' Organization
YR
- YRR – "Young, Restless, and Reformed", an alternative name for the New Calvinist movement
YS
- ys – Yoctosecond
- yS – Yoctosiemens
- Ys – Yottasecond
- YS – Yottasiemens
- YSA
- * Young Single Adult, a designation used by the LDS Church for single adults under 30
- * Young Socialist Alliance
- * Youth Service America
YT
- yT – Yoctotesla
- YT
- * Mayotte
- *Yottatesla
- *Yukon Territory
- YTD – Year-To-Date
- YTM – Yield to Maturity
- YTS – Youth Training Scheme
- YTT – Yoshi Topsy-Turvy
- YT – YouTube
YU
- YU
- * York University
- * former Yugoslavia
- YUG – former Yugoslavia
- Yuppie – Young Urban Professional + suffix
YV
YW
- yW – Yoctowatt
- YW – Yottawatt
- YWCA – Young Women's Christian Association
- YWMV – Your Wallet May Vary
YY
- YYH
- * YuYu Hakusho
- * Taloyoak Airport, IATA airport code
- YYK – Yeah you know