Razor

...However, novice priests, novice monks, monks, and nuns are required to shave their heads in accordance with the precepts, and in monastic halls and other facilities, shaving of the head is required every five days. In the Jodo Shinshu sect, the ceremony to receive a Buddhist name (kaimyo) is called "okamisouri," which is similar to the ordination ceremony, and involves a virtuous teacher applying a razor to the head. The head was also shaved when leading the deceased to the afterlife, but now it has become a formality and in many cases the head is simply shaved....

*Some of the terminology explanations that mention "okamisouri" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…しかし沙弥（しやみ），沙弥尼，比丘（びく），比丘尼は戒律にしたがって剃髪し，僧堂などでは5日目ごとの剃髪が規定されている。浄土真宗では法名(戒名)をうけるための帰敬式を，得度式に擬して〈おかみそり〉といい，善知識が髪にかみそりをあてる。死者の引導にも髪をそったが，いまは形式化して，かみそりをかざるだけというのが多い。…

※「おかみそり」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報