The Ree group is the automorphism group of a Steiner system.
Ree Group
See also
Steiner SystemReferences
Dixon, J. and Mortimer, B. Permutation Groups. New York: Springer-Verlag, 1996.Referenced on Wolfram|Alpha
Ree GroupCite this as:
Weisstein, Eric W. "Ree Group." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/ReeGroup.html