What means
It fills all six cells in a separated mosaic. A sextant here is one character-sized grid divided into two columns and three rows; each small block acts like a chunky pixel. Teletext used such mosaics to draw simple pictures in text pages. Here, every cell is on, while the background remains visible between them.
The recognizable design was part of broadcast teletext by 1974: its specification defined six-cell graphics in contiguous and separated modes. A 1977 BBC report describes graphics as a presentation feature of the Ceefax information service. Teletext changed the gap style with a display control; a 2021 Unicode proposal says separate characters were needed to preserve those patterns in teletext emulators and existing software.
Don't confuse it with
1Questions people ask
1Why does it show as an empty box?
Your font may not include this glyph. Try one that covers the character; the stored text stays the same when its on-screen shape changes.
How to type
𜺏\1CE8FCodes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.
