Japanese geoduck
A species of large saltwater clam native to Japan, Panopea japonica. Often used in sushi and sashimi.
The Japanese geoduck is a type of mirugai clam and is popular as a sushi topping.
Usually written in katakana for this species name; the kanji form 波貝 is rare.
Kanji spelling is uncommon; the katakana form ナミガイ is standard.
The name likely derives from 波 (nami, 'wave') + 貝 (kai, 'shellfish'), but the exact origin is uncertain.