| U | You | |
| U/L | Upload | |
| U2 | You Too | |
| UCE | Unsolicited Commercial E-Mail | |
| UKWIS | You Know What I'm Saying | |
| UL | Upload | |
| U-L? | You Will? | |
| U-OK | You Ok? | |
| UR | You Are | |
| UR | Your | |
| UR2M | You Are Too Much | |
| URA* | You Are A Star | |
| URAQT | You Are A Cutie | |
| URC | You Are Caught | |
| URSKTM | You Are So Kind To Me | |
| USAD | You're Such A Dork | |
| USB | You Sexy Babe | |
| UV | Unpleasant Visual | |
| UW | You’re Welcome | |
| UY | Up Yours | |
| (-: to the Emoticons :-) |
