Abbreviations
Some Toki Pona words have nonstandard abbreviations.
kepeken
kepeken is tied with sitelen as the longest nimi pu. It has accrued many abbreviations, such as kepen (listed in ijo Linku) and kpkn.
The 3-letter[1] abbreviations kkn, kpk and kpn cannot be mistaken for any other nimi ku or word in Linku. kep only overlaps with okepuma, an obscure non-ku nimisin.[2]
Can we go further? While kk conflicts with several nimi ku, it is unique among nimi pu, though probably extremely unclear. Every other 2-letter abbreviation is more ambiguous.
Notes
kijetesantakalu
kijetesantakalu is often shortened to kijete or kije. Some speakers dislike this, as the original point of the word was to be overly long, while proponents of these abbreviations may like and use the word for unrelated reasons.