What ⯺ means
It marks united or connected pawns.
Chess Informant, a Serbian chess magazine, used compact marks for language-neutral analysis. It became important in the 1960s, helping spread chess expertise across the Iron Curtain, the Cold War divide between east and west Europe. A 1993 multilingual chess encyclopedia lists this mark among widely used chess notation.
In the 2017 Unicode proposal, it was called “Union Symbol”; its chess reading was “united pawns.”
Chess-analysis shorthand; outside chess, its meaning needs context.
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 ⯺
⯺\2BFACodes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.