Technical term for the metal mouthpiece of a horse's bridle. Rare in everyday language; more commonly referred to as 馬銜 (はみ) or ビット.
I came across the word 勒 in equestrian materials.
second stroke in the Eight Principles of Yong; rightward stroke
Calligraphy term referring to the second stroke of the character 永 (ei), a horizontal stroke that bends slightly upward. Used in the context of the Eight Principles of Yong (永字八法).
See also: 永字八法
The second stroke in the Eight Principles of Yong is called 勒.
bridle
manage; control; rein in · carve; inscribe; write for posterity
The kanji 勒 originally meant 'bridle' or 'to rein in'. The reading ろく is the on'yomi. The calligraphy sense derives from the shape of the stroke resembling a rein.