Answer the following question, with explanation first.
Context: The Christian cross, seen as a representation of the instrument of the crucifixion of Jesus, is the best-known symbol of Christianity. It is related to the crucifix (a cross that includes a usually three-dimensional representation of Jesus' body) and to the more general family of cross symbols.\n\nQuestion: what is the meaning of the cross for christianity?

a representation of the instrument of the crucifixion of Jesus
The relevant sentence in the passage is: The Christian cross, seen as a representation of the instrument of the crucifixion of Jesus, is the best-known symbol of Christianity.

.

Final answer: a representation of the instrument of the crucifixion of Jesus