Omusha

Omusha (オムシャ), also umusa[1] or umsa,[2] was an Ainu greeting ritual that, like the related uimamu (ウイマム), became a ceremonial—of trade—full of the political symbolism of subservience, to the Matsumae Domain.

[2][3][4][5][6][7][8][9] The word is understood to derive from the Ainu u (ウ), referring to mutuality, and musa (ムシャ), translated and defined by John Batchelor as "to stroke the head in salutation".

[8][10]