At least Meta made a unique mark. "𝕏" is a mathematical symbol, known as a doublestruck, or blackboard bold, letter X. You can't get trademark on a mathematic

At least Meta made a unique mark. "𝕏" is a mathematical symbol, known as a doublestruck, or blackboard bold, letter X. You can't get trademark on a mathematical symbol, generally. https://www.compart.com/en/unicode/U+1D54F https://www.compart.com/en/unicode/U+1D54F https://en.wikipedia.org/wiki/Blackboard_bold https://en.wikipedia.org/wiki/Blackboard_bold Such a letter 𝕏 is sometimes used to represent arbitrary or generic metric space: https://en.wikipedia.org/wiki/Metric_space https://en.wikipedia.org/wiki/Metric_space There is already another Hacker News thread that is dealing with this specific symbol: https://news.ycombinator.com/item?id=36846076 https://news.ycombinator.com/item?id=36846076