@eWalthert @letterror @MauriceMeilleur @justvanrossum @jeremiehornus @glyphs (Adam here) I've once suggested the master to be renamed MATRIX or MATRICE (like that thing that metal type is cast from). Matrices been an integral part of type making. The phonetic similarity to master is useful. I find "source" to be very generic — in one way, the entire .vfj, .glyphs or .designspace+.ufo is »the source(s)«.