noun
perforated coin; coin with a hole
Refers to old Japanese or Chinese coins with a square or round hole in the center. Often used in historical or numismatic contexts. See also 穴銭.
See also: 穴銭
この穴あき銭は江戸時代のものだ。
This perforated coin is from the Edo period.
穴あき銭を紐に通
They kept perforated coins by threading them on a string.
穴銭 is a shorter synonym for a perforated coin, often used in the same historical context.
Compound of 穴あき (hole-opened) and 銭 (coin). The exact historical derivation is uncertain, but the term straightforwardly describes coins with a central hole.