Nouncrack; crevice; fissure; chap; rift

Nounpattern; example; model; paragon; mirror

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

Nountortoise-shell divination (in ancient China and Japan)

Nounshield bug; stink bug; pentatomid

Nounyoung turtle (tortoise) · turtle (tortoise) shell

Nounbarnacle

Expressions (phrases, clauses, etc.), Nountortoise shell · hexagon pattern; hexagon shape · benzene ring; benzene-ring structure