What ⥳ means
The formula’s author defines the relation.
The arrow-and-tilde shape tells you what the mark looks like, not what rule the formula uses. Check the surrounding notation or the author’s definitions before assigning it a reading.
In MathML 3 (2010), ⥳ is classified as an infix operator and marked as an accent. “Infix” means it can sit between expressions; “accent” is a layout cue: in an overscript position, a renderer keeps it at the base expression’s size and closer to the expression. These labels control presentation, not mathematical meaning.
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 ⥳
⥳\2973Codes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.