What I meant was that "120" is not a measurement. It is the name for the format. Other such names are 116, 220, 135, 127, etc. It makes no sense whatsoever to put "mm" after it. It's simply "120 film," not "120mm film."
"Truth and love are my law and worship. Form and conscience are my manifestation and guide. Nature and peace are my shelter and companions. Order is my attitude. Beauty and perfection are my attack."