Jesus fish

plural Jesus fishes

1. colloquialThe ichthys, a symbol of a fish made from two intersecting curved lines, representing Christianity.

   1 more example

   The Jesus fish has become a symbol of modern Christianity, depicted on bumper stickers and jewelry to show that the owner is a Christian. The symbol has spawned a variety of spin-offs, and some argument, including the Darwin Fish^([sic]), the gefilte fish, fish and chips, lutefisk, and Jesus fish eating Darwin fish.

   2011, Gene Helfman, Bruce Collette, Fishes: The Animal Answer Guide, Johns Hopkins University Press, →ISBN, page 132