What ⸟ means
Repeat the headword stem; write the resulting word in lowercase. With Buchmacher as the headword, ⸟mäßig expands to buchmachermäßig (“bookmaker-like”).
A specialist dictionary mark, not general-purpose prose punctuation.
Don't confuse it with
1Questions 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 ⸟
⸟\2E1FCodes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.
