a matrix, the zero matrix, if F is not equipped with a Schreyer order, otherwise a matrix with source F, such that the monomial order on F is the one induced by this matrix.
The source of this document is in /build/reproducible-path/macaulay2-1.25.06+ds/M2/Macaulay2/packages/Macaulay2Doc/functions/schreyerOrder-doc.m2:74:0.