Nouncrack; crevice; fissure; chap; rift

Nounpattern; example; model; paragon; mirror

Nountortoiseshell; tortoise shell · tortoiseshell pattern; honeycomb pattern; hexagonal pattern · tortoiseshell bracket (punctuation mark)

Nounglans (esp. glans penis)

Nountortoise-shell divination (in ancient China and Japan)