Braille Pattern Blank "⠀" (U+2800) is another one of my favourites, since it's also not considered whitespace, but it looks like it. It can actually be fairly helpful for forms that won't let you leave any field blank, since it bypasses most whitespace checks.

▲

eviks 14 hours ago | parent [-]

Indeed, the ossification of this old absurdity can be helpful, also for visual alignment within names.

This prompted me to finally dig a bit and find the official reference why they didn't fix the bug despite a plea from some Braille council

https://www.unicode.org/L2/L2025/25183-utc184-properties-rec...

	▲	networked 12 hours ago \| parent [-]
		> It was found that many publications that use Unicode Braille characters use U+2800 with a marking glyph. A marking space is not without precedent, consider U+1680 OGHAM SPACE MARK. However, in some cases, U+2800 is clearly used as a symbol, to indicate the presence of a space when describing a Braille sequence corresponding to a symbol or punctuation, similar to the use of ␣ (U+2423 OPEN BOX) to indicate the presence of a space. Especially in cases where it is used in a trailing position, as in the [UNE13] example, it is clear that it would be inappropriate for this symbol to disappear. > Considering this usage as a marking symbol, together with concerns about changing the relatively stable—and often hardcoded—White_Space property (a property of only 25 code points, last changed in Unicode 6.3, when U+180E MONGOLIAN VOWEL SEPARATOR ceased to be a space), the PAG preferred a more targeted change. This doesn't seem that unreasonable.