Catholic, Eastern Orthodox, and some of the Anglican and Lutheran Churches use crucifixes. The Eastern Rite Catholic and Eastern Orthodox Churches' crucifixes are flat, with the "corpus" (or depiction of Christ's Body) painted on it.
Ideally, a crucifix is above the altar, or behind it (sometimes, it sits on top of it). This is to serve as a reminder that the Sacrifice of the Cross is the same Sacrifice that takes place during the Mass (no, Catholics don't try to sacrifice Christ many times. The Sacrifice of the Cross is eternal.)
The Twelfth Station of the Cross (out of fourteen) is the Crucifixion and Death of Jesus, so a crucifix is central to any depiction of that station.
In every Catholic altar, there should be a relic of one of the saints, which is usually a fragment of bone. This is done in imitation of the practice of ancient Christian who said the Mass on top of the tombs of martyrs.
I don't mind the spelling correction. I am learning more now as a old gal then when spent dirsupting classes with clowning around as a kid.
So feel free to correct my grammer/spelling any time.
(I kinda miss the old dayz around here when we had posters do so on a regular basis)
I flunked sewing class/home making class to so I don't know how to alter a dress.