Definition:Angstrom (Unit)/Linguistic Note
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Linguistic Note on Angstrom
The word angstrom is derived from a Swedish name, and properly has diacritics: ångström.
However, this "correct" presentation is tedious to implement and a nuisance to maintain, so $\mathsf{Pr} \infty \mathsf{fWiki}$ prefers the simple version angstrom.
Its symbol, however, does need the small circle above the A in order to be accurate and unambiguous.
This, unfortunately, is not straightforward to render in $\LaTeX$ without including further expansion sets.
Hence the $\LaTeX$ form as $\mathring {\mathrm A}$ (not a strictly accurate rendition) is how it is presented on $\mathsf{Pr} \infty \mathsf{fWiki}$.