A Hasse graph is a Hasse diagram ready for display. It contains labels instead of Weyl group elements and reflections.
The object HasseGraph is a type, with ancestor classes BasicList < Thing.
The source of this document is in /build/reproducible-path/macaulay2-1.25.06+ds/M2/Macaulay2/packages/WeylGroups.m2:4374:0.