True North
Trump Card
Trust But Verify
Trusted Advisor
T's And C's
T-Shirt Sizing
Turn Around
Turnaround Time
Tweeps
Twitterverse
Two Pizza Rule
Two Week Notice
Uberization
UML
UML Diagram
Uncharted Territory
Under-Index
Underpaid
Underscore
Unicorn
Unplanned Work
Unquit
Unreasonable Request
Unregretted Attrition
Unspoken Rule