A key in the hash table of a ring which is used to store the Dynkin type of the group acting on the ring. Set this using the setWeights command.
The object GroupActing is a symbol.
The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/HighestWeights/doc.m2:83:0.