What means
It supplies the right-hand stroke in a larger letter.
HP introduced the 2640A in 1974. On HP 2620 and 2640 terminals, a separate large-character set built headline letters from smaller pieces arranged in a grid. This piece supplied a right-hand stroke, while neighboring pieces completed each letter. Later HP 2645 models stored the set in the same read-only memory chip as regular Latin letters, math, and line-drawing symbols. A Unicode proposal submitted in 2021 documented the historical set with an HP Journal illustration and a terminal-manual excerpt.
Don't confuse it with
4Questions people ask
1Why does 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
𜸥\1CE25Codes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.
