n/t is
Internet BBS shorthand for "no text." One puts it in at the end of a
subject field to indicate that there is no
information within the body of the post, and only within the subject. Frequently used on BBS's where most information is just one-liners in the
subject. n/t is the semantic opposite of
r/o. Some people use
EOM (end of message) instead of n/t.
Example: You're dumb! (n/t)