I was inspired by an item in the James Avery catalog. I tried to look up more information about the detail and symbolism associated with it. I assume the twelve squares represent the apostles? I don’t know, and it may be an original creation. (Input welcome.)
However, in my searching, I discovered another sort of disciples cross. The center being “Abide in Christ” and from which the four parts of growth and maturity as a follower of Jesus come out. I added the ideas, though the actual words varied among the sites I visited.