Let $AB$, $BC$ and $CA$ be geodesic curves between $A$ and $B$, $B$ and $C$, and $C$ and $A$ respectively.
The figure enclosed by $AB$, $BC$ and $CA$ is known as a geodesic triangle, and can be denoted $ABC$.
Weisstein, Eric W. "Geodesic Triangle." From MathWorld--A Wolfram Web Resource. http://mathworld.wolfram.com/GeodesicTriangle.html