Paper

From Memory Alpha, the free Star Trek reference.

Paper was a material made from wood or by insects such as bees. Paper was often used as something to write on.

Phlox made a model of a Pyrithian moon hawk out of blue paper. (ENT: "A Night in Sickbay")

A Klingon proclamation on Organia was printed on paper. (TOS: "Errand of Mercy")

The Elected One Beata of Angel I signed several documents on paper. (TNG: "Angel One")

Paper was also used on planet Malcor III. Chancellor Avel Durken put a stamp on several Malcorian documents on paper. (TNG: "First Contact")

Members of Makull's species still used paper, to print flyers, for example. (VOY: "Time and Again")

Jake Sisko wrote Anslem on paper given to him by Onaya. (DS9: "The Muse")

In 2374, Chakotay used paper to remember his time with Kellin on board USS Voyager before he forgot about her due to a virus that wiped out computers' and individuals' memories of anyone who was in contact with a Ramuran. (VOY: "Unforgettable")