This is the front chainring for Shimano's gravity-focused Saint FC-M820 crankset, a 1x10-speed ring built around Saint's Hollowtech II hollow-forged aluminum crank platform and designed to take repeated hard impacts on descents.
It's sold as a genuine Shimano replacement part for riders rebuilding or re-ringing a Saint crankset, and is compatible with 68/73mm bottom brackets.