Wikipedia says¹: > Although `​` is one HTML5 named entity for U+200B, the additional names `NegativeMediumSpace`, `NegativeThickSpace`, `Negativ

Wikipedia says¹: > Although `​` is one HTML5 named entity for U+200B, the additional names `NegativeMediumSpace`, `NegativeThickSpace`, `NegativeThinSpace` and `NegativeVeryThinSpace` (which are names used in the Wolfram Language for negative-advance spaces, which it maps to the Private Use Area) are also defined by HTML5 as aliases for U+200B (e.g. `​`). Following links, it looks like somebody went through a bunch of mathematics software looking for all the symbol names somebody might be used to, so they could be added to the official list of named entities. ¹: https://en.wikipedia.org/wiki/Unicode_character_property#Whitespace https://en.wikipedia.org/wiki/Unicode_character_property#Whi...