The Egyptian hieroglyphic ankh looks kind of similar to the Christian cross. This has lead some conspiracy theorists to argue that Christians copied the ankh for their own religious symbol: the cross.

Figure 2: Genetic map of 5p15.1 and genomic organization of ANKH. Figure 3: Cosegregation of ANKH mutations with the CMD phenotype. All eight families with mutations in ANKH are shown. We ...

The symbol of an ankh or key of life, Relief, First courtyard of Ramses II, Temple of Luxor, Dynasty XIX (1320-1200 B.C.), New Empire, Egypt. (Photo by Prisma/UIG/Getty Images) ...