What ⯿ means
They helped operators match the machine's motor speed. While held, the key sent the mark at a reduced rate and stayed latched until another key was pressed.
A German Feldfernschreiber manual dated 1941 documents the key. The machine printed messages on paper tape; the mark was distinct from message letters.
Specialist equipment notation: the pause means holding a telegraph connection, not pausing a sentence.
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 ⯿
⯿\2BFFCodes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.
