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.
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
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
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
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
YW
YY
- YYH
- YYK – (i) Yeah you know
YZ
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