[Alexa]

YT, yt. What are these?

  Let's learn what are these YT and yt!

[MSL]

 Okay. Some information about YT (yt) here:

YT or yt may refer to:
Yukon Territory, Canada
YouTube
Whitey Slang for white persons
Yottatesla, an SI unit of magnetic flux density equal to 1024 teslas
Mayotte's ISO 3166-1 alpha-2 code
.yt, Mayotte's country code top-level domain
Air Togo's IATA airline designator
Y.T., a character in Snow Crash by Neal Stephenson

^{https://en.wikipedia.org/wiki/YT https://en.wikipedia.org/wiki/Wikipedia:Text_of_Creative_Commons_Attribution-ShareAlike_3.0_Unported_License}
 And some more meanings: http://www.urbandictionary.com/define.php?term=yt