Triplicate. You don't hear it used to often anymore with the invention of the copy machine and electronic documents but they used to consist of a piece of paper usually white, carbon paper, yellow paper, carbon paper, pink paper. Or three white pieces with carbon paper in between them. Used for official documents.
Something made in quadruplicate is an original and three copies. Triplicate is original and two copies.
triplicate
Triplicate.
a. The third of three copies.b. Making something in three copies3 copies.
photocopier
The word you're looking for is... triplicate.
The three later word that means view is see.
The word is trisect.
Trio.
tri tripod
Three - the word tri means three
Observe means to see.
Triple means three times as much.