内胆

Traditional form:

內膽

Pinyin (reading):

nèidǎn

Definitions:

• inner container (e.g. the rice pot inside a rice cooker, the vacuum bottle inside a thermos, the tank inside a hot water heater, the bladder of a football)

Characters:

• 内 - inside
• 胆 - gallbladder; gall, guts, courage

Traditional characters:

• 內 - inside
• 膽 - gallbladder; gall, guts, courage