- \sphericalangle ( math mode, \usepackage{amssymb} )
- \measuredangle ( math mode, \usepackage{amssymb} )
- \angle ( math mode )
\sphericalangle AOB = angle between two intersecting arcs on a sphere ( closed curve ), specifically the angle between the two planes containing the arcs [There seems to be a distinction in notation where the center point/centre node letter is O, not B]
\measuredangle ABC = the actual measured angle between points/nodes A and C at point/node B
\angle ABC = angle between points A and C at point B (the middle letter is the vertex) [I have also seen this used to define angles in Euclidean triangles].
Bibliography
https://tex.stackexchange.com/
https://math.stackexchange.com/
https://detexify.kirelabs.org/
https://artofproblemsolving.com/wiki/index.php
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