Nüshu Iteration Mark

It stands for the Nüshu glyph just written. In context, read 𖿡 as an instruction to supply the preceding glyph or syllable again. Nüshu is a syllabic script for the local Chinese dialect of Jiangyong in southeastern Hunan; its signs are mostly based on Chinese characters and usually represent syllables. This mark is punctuation within that script.

Nüshu grew as a women's writing tradition in Jiangyong; many users could not write Chinese characters. Its texts include poems, letters between sworn sisters (women bound by a mutual vow), and sanzhaoshu, “third-day” booklets of good wishes presented to a bride by her friends three days after the wedding.

The earliest known Nüshu artefact is a bronze coin found in Nanjing, the capital of Jiangsu, and minted during the Taiping Heavenly Kingdom (1851–1864), a short-lived rebel kingdom in China. A documentary record of Nüshu appears in a Hunan survey from 1933.

Can 𖿡 replace a Chinese repetition mark?

No; it repeats within Nüshu writing. The Old Chinese Iteration Mark 𖿣 and the vertical sign 〻 are separate characters; 〻 appears in Chinese manuscript transcription. They do a similar job in different writing traditions, so 𖿡 is not a substitute for either.

Read the script around it: 𖿡 belongs to Nüshu writing, so outside that context ask which glyph it is meant to repeat.

Why does 𖿡 appear as a box?

The font may not include the character. 𖿡 is text, and the font supplies its drawn shape. A missing-glyph box means the font cannot display it; switching to a font that includes Nüshu may make it visible. Different fonts can draw it differently without changing which character it is.