Noun
usr (plural usrs)
(computing) Abbreviation of user.
Thus, two USR modems would be able to connect at 9600 bit/s, but, when a user with a 2400-bit/s modem called in, the USR would "fall back" to the common 2400-bit/s speed. Source: Internet
The tower is shown surpassed in height by the USR (United States Robotics) Building. Source: Internet
The USR() function is also defined differently, serving as a stand-in for the absent CALL command. Source: Internet