pure double chow; two identical sequences
A mahjong hand containing two identical sequences (same numbers and same suit). Worth one han.
from Chinese yī bēi kǒu
A pure double chow is a hand with two identical sequences.
This hand has a pure double chow, so it's worth one more han.
Standard kanji spelling for this mahjong term.
Katakana spelling is common in mahjong contexts.
From Chinese 一盃口 (yī bēi kǒu), literally 'one cup mouth', a mahjong term.