Medium Mathematical Space Plus Hair Space HTML entity  

 : HTML entity for Medium Mathematical Space Plus Hair Space   (U+205F U+200A), with decimal, hex, CSS, JavaScript, Python and URL codes.

Entity:  
Code points: U+205F U+200A
Unicode name: MEDIUM MATHEMATICAL SPACE + HAIR SPACE
Block: General Punctuation
Category: Space separator (Zs)
Since: Unicode 3.2
Defined in: HTML5

Codes to copy

HTML named	` `Works in HTML; in XML only & < > " ' are predefined.
HTML decimal	`  `Works in HTML and XML.
HTML hex	`  `Works in HTML and XML.
CSS	`content: "\205F \200A";`In a stylesheet, for ::before and ::after.
JavaScript	`"\u205F\u200A"`Also valid in JSON.
Python	`"\u205f\u200a"`Python 3 string literal.
URL	`%E2%81%9F%E2%80%8A`Percent-encoded UTF-8 bytes, for a path or query value.
UTF-8 bytes	`E2 81 9F E2 80 8A`6 bytes in all.
UTF-16	`205F 200A`2 code units, which is what JavaScript length counts.

When to use it

  writes a sequence of 2 code points (U+205F U+200A) that together show as one symbol. Specialist notation like this usually belongs in MathML, which positions it correctly; the entity is for occasional use in running text.

The name comes from the HTML5 list (much of it shared with MathML), so it works in every current browser but not in XML or XHTML served as XML, where the numeric reference is the safe choice.

More advanced maths and arrows

All advanced maths and arrows · Every HTML entity · Encode or decode text

Source: the WHATWG HTML Standard list of named character references and the Unicode Character Database (Unicode 18.0).