What 𰬁 means
It is a written variant linked to a character for hemp thread.
Unicode records 𰬁 as a simplified variant of 䋆, a related written form. In Japanese, a kanji (Chinese-derived character) dictionary gives 䋆 the readings ro and kase and meanings for hemp thread and preparing that fiber. Those readings belong to 䋆; the variant link is what supports a thread-related sense for 𰬁.
Unicode’s source index also cites Zhonghua Zihai, a Chinese character dictionary, page 1313, for this form.
Why might 𰬁 appear as a box?
A font or app without its glyph may show a missing-character box.
𰬁 sits in a supplementary CJK ideograph block, so a font needs a glyph for it to show its strokes. Without that coverage, it may appear blank or as a missing-glyph box; the stored text remains 𰬁.
Questions people ask
1Why does 𰬁 show as a box on some devices?
Because that device's fonts have no glyph for it. The character is still correct and still copies correctly — the box is a missing glyph, not a broken character.
How to type 𰬁
𰬁\30B01Codes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.