hand salute; military salute
A formal gesture of respect, typically raising the right hand to the head or hat, used in military and similar contexts.
兵士は上官に挙手の礼をした。
The soldier gave a hand salute to the superior officer.
Compound of 挙手 (きょしゅ, 'raising one's hand') and 礼 (れい, 'salute, bow'), literally 'hand-raising salute'.