Kanagi

...A ceremony in which criminals who commit theft or mint coins are put in a shackle called a kanagi and taken out among the people to be punished as an example. It began in the early Heian period, and according to a ceremony from the mid-10th century, on a day selected in May or December, the head of the Kebiishi-cho (police office) would lead a prisoner to the East or West Market, where officials below the rank of Emon-no-suke would put a kanagi on the prisoner and send him to prison based on his condition. ...

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

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…盗犯，私鋳銭などの犯人に釱（かなぎ）と称する首かせをつけて衆人の中に連行し，見せしめとして懲罰を加える儀。平安時代の初頭に始められ，10世紀中ごろの儀によると，5月と12月に日をえらび東市または西市に検非違使庁の看督長（かどのおさ）が囚人を率いて至り，衛門佐以下の官人らが囚人の過状にもとづいて釱を着けさせて獄に送っている。…

※「釱」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