YY or variants may refer to:
YY1 (Yin Yang 1) is a transcriptional repressor protein in humans that is encoded by the YY1 gene.
"YYZ" is an instrumental rock piece by Canadian rock band Rush, from their 1981 album Moving Pictures.
YY (Chinese: YY语音) is a major Chinese video-based social network with over 300 million users. It features a virtual currency which users earn through activities such as karaoke or creating tutorial videos and which is later converted to real cash.
Yyrkoon is a French death metal band. The main lyrical themes revolve around occultism, horror/fantasy, and members' personal philosophies.
The yybP-ykoY leader RNA element was originally discovered in E. coli during a large scale screen and was named SraF.
YYOGA is a yoga, fitness, and wellness company based in Vancouver, British Columbia. It is the largest corporately-owned yoga company in Canada.
ISO 8601 Data elements and interchange formats – Information interchange – Representation of dates and times is an international standard covering the exchange of date- and time-related data.
Pyongyang, or P'yŏngyang (UK: , US: ; Korean pronunciation: [pʰjʌŋ.jaŋ]), is the capital and largest city of North Korea.