time T

time T: /tim T/ n.  1. An unspecified but usually
   well-understood time, often used in conjunction with a later time
   T+1.  "We'll meet on campus at time T or at Louie's
   at time T+1" means, in the context of going out for dinner:
   "We can meet on campus and go to Louie's, or we can meet at
   Louie's itself a bit later."  (Louie's was a Chinese restaurant in
   Palo Alto that was a favorite with hackers.)  Had the number 30
   been used instead of the number 1, it would have implied that the
   travel time from campus to Louie's is 30 minutes; whatever time
   T is (and that hasn't been decided on yet), you can meet
   half an hour later at Louie's than you could on campus and end up
   eating at the same time.  See also {since time T equals minus
   infinity}.