Ecklonia cava (brown alga)
A species of brown seaweed found in coastal waters around Japan and Korea; used in food and traditional medicine. The term is rare and technical; usually written in katakana.
Ecklonia cava is a brown alga of the kelp family, distributed in the seas around Japan.
カジメ (Ecklonia kurome) is a closely related species; ノロカジメ is sometimes considered a variety or synonym, but the name ノロカジメ specifically refers to Ecklonia cava.
Katakana spelling is standard for this seaweed name; the kanji form 野呂搗布 is rare and obscure.
Obscure kanji spelling; learners will almost always encounter the katakana form.
The name likely derives from a local or historical Japanese name for this seaweed; the exact origin is uncertain. The kanji 野呂搗布 are ateji and not commonly used.