noun
ren (ancient Chinese unit of length)
An ancient Chinese measure of height, depth, or length, roughly 1–3 meters. Now only encountered in historical or classical contexts.
古典では「仞」という単位が深さを表すのに使われた。
In classical texts, the unit 'ren' was used to express depth.
From Chinese 仞 (rèn), an ancient unit of length. The Japanese reading じん is the on'yomi.