pi
pi is a particle in toki pona.
It is the exact toki pona equivalent of “of”
How it works
pi is of, it regroups modifiers.
By default, when you have a string of content words, the way they modify each other is from left to right.
tomo telo nasa = (tomo telo) nasa = strange (water-room) (may be strange restroom)
But when you use pi, you can change the order of the parentheses a little bit
tomo pi telo nasa = tomo (telo nasa) = (strange water) room
Strange water is usually alcohol, so this usually means bar.
If there is only one word that comes after the pi, the pi should not be there, because it is not regrouping anything. After all, if pi didn’t meant of, the language of good would be toki pona, not toki pi pona.