The Unicode character U+200A represents the "Hair Space," which is an extremely narrow whitespace character. It is narrower than a standard space (U+0020) and serves the purpose of providing an extremely fine and subtle amount of space between characters or elements.
You can copy Hair Space here and use it wherever you like:
| Unicode | U+2000A |
|---|---|
| HTML Entity |   or   |
| LateX | hspace{0.16667em} |
| CSS | \u200A |