Archaic term for the number sixteen, formed by combining two (二) and eight (八). Not used in modern Japanese; replaced by 十六 (じゅうろく).
In classical texts, '二八' was read as 'にはち' and meant sixteen.
soba made with 20% wheat flour and 80% buckwheat flour
An elliptical multiplication expression: 二八 means “two times eight,” hence sixteen.