Awesome presentation as usual @Deacon Ray This article seems to go over it pretty well. https://www.beastcoins.com/Collections/OriginsOfTheCross/CrossOrigins.htm
@Ajax, thanks for the link to Beast's article on crosses. For Christian symbols on Roman coins, see my site: http://augustuscoins.com/ed/Christian/ChristianSymbols.html
Most symbols used by Christians predate Christianity. The Beast Coin article on the "Origins of the Cross". (Thanks for posting, Ajax! @Ajax) is very good at discussing the history of the symbols. This coin was part of the T. B. Cartwright collection.