So a while back I wrote about one way to make nouns out of verbs, by repeating the syllables that make up the verb stem. For an example, the verb k’win- means ‘to shoot’; nk’wint=I shot it. And k’wink’win means slingshot, literally a shooter.
Another way is to add –ii which is a ‘medio-passive’. Which means less passive than a passive construction. A mediopassive would be ‘the basket got broke’ rather than ‘the basket was broken’. So marks, like pen marks or paint marks are called hltii, literally ‘it is marked’. When pencils were introduced, the word for them was derived from the same verb – tlahltii.