JR[LN]: /J-R-L/, /J-R-N/ n. The names JRL and JRN were sometimes used as example names when discussing a kind of user ID used under {{TOPS-10}} and {WAITS};

:JR[LN]: /J-R-L/, /J-R-N/ n. The names JRL and JRN were
sometimes used as example names when discussing a kind of user ID
used under {{TOPS-10}} and {WAITS}; they were understood to be
the initials of (fictitious) programmers named `J. Random Loser'
and `J. Random Nerd' (see {J. Random}). For example, if one
said "To log in, type log one comma jay are en" (that is,
"log 1,JRN"), the listener would have understood that he should
use his own computer ID in place of `JRN'.
-- The AI Hackers Dictionary