A person 亻 stands beside the officer-with-tally sign — someone
is being given the job. To send on a mission, to employ, and in
grammar the causer: 使send · shǐ · to send, employ, cause X do Y, “make X do Y.” An envoy is this
character with a title. Taught in
the making-it-happen chapter.
How to remember it
A thin person at the left, the official with his tally at the
right: hand someone the job and send them — or, in grammar,
make them do it.