What means
A mosaic tile with its right column lit. Here, a sextant is one text cell split into six blocks, two across and three down; 2, 4 and 6 mark the lit cells. Neighbors can join to sketch maps, charts, lettering or pictures.
British teletext’s shared format was agreed in 1974. Its mosaic tiles let text-only TV pages show maps and charts; artists also used them for lettering and full-page art. A control code—an instruction in the page data—switched between joined and separated displays, leaving narrow background gutters. The 2021 Unicode proposal asked for separate characters so emulators could recreate teletext and existing programs could keep their custom mappings.
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
𜹺\1CE7ACodes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.