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In page Salute:

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According to some modern military manuals, the modern Western salute originated in France when knights greeted each other to show friendly intentions by raising their visors to show their faces and show that they are not carrying a weapon (in their right hand).[citation needed] Others also note that the raising of one's visor was a way to identify oneself saying "This is who I am, and I am not afraid." Medieval visors were, to this end, equipped with a protruding spike that allowed the visor to be raised using a saluting motion.[1][2]