EmptySmallCircle
\[EmptySmallCircle]
Alias: esci. Letter-like form. Not the same as the infix operator \[SmallCircle]. Used as an overscript to add ring diacritical marks. See The Mathematica Book: Section 3.10.3. See also: \[FilledSmallCircle] , \[Degree] , \[ARing] , \[Angstrom] .