noun
blessing of heaven; heavenly hand
In mahjong, a special winning hand where the dealer wins with the initial 14 tiles dealt, before drawing or discarding. A very rare and celebrated yaku.
from Chinese tiān hú
天和は、親が配牌でそのまま上がる役満だ。
Tenhou is a yakuman where the dealer wins with the initial dealt hand.
彼は天和を達成して、一気にトップに立った。
He achieved a blessing of heaven and shot to first place.
From Chinese 天和 (tiān hú), literally 'heavenly harmony'. The kanji 和 is used in mahjong for a winning hand.