Crossbill

鶍 is a Japanese-made character for the bird name いすか. The bird is a crossbill, named for its curved bill tips, which cross. The name is attested by the mid-Muromachi period, a medieval era in Japan. A study comparing copies of Setsuyōshū, a medieval Japanese wordbook, finds いすか written with 鵙 in some copies and 鶍 in another; a Japanese reference also lists 鶪 as a variant of 鶍.

The crossed bill gave the bird name a figurative use. In the Edo period, いすか could describe speech that no longer matched what came before; in 1906, a Japanese building dictionary also used it for cuts that cross at a post or beam end, making the pieces lock together. The fixed phrase 鶍の嘴 turns the bird's crossed bill into a mismatch between plans, accounts, or intentions.

What does 鶍 mean when someone sends it?

By itself, 鶍 does not clearly signal a mismatch. In 鶍の嘴, the beak points to crossed intentions or a plan that fails to line up.

A birding article published in 2021 reports a 2019 seminar comment that younger people increasingly did not know the saying. If someone sends 鶍 alone, they may mean the bird or leave you wondering what it is; use the full phrase or say 食い違い when the mismatch reading must be clear.

Why does 鶍 appear as a box?

On some devices, a font may draw 鶍 differently or leave a box. That is a display issue; the reading comes from the text around it.