The codenames for every major Debian release are named after characters from Pixar’s Toy Story franchise. Debian’s unstable release is fittingly named after Sid, an unstable character from the Toy Story movies.
Pine also competed with “elm”. And it used the “pico” editor which was replaced by “nano”…
And pico is short from ‘Pine Composer’. Nano was originally called ‘tip’ (This Is not Pico), but that name was already used by another program. And ‘elm’ besides being a tree is a short from ‘Electronic Mail’.