I will probably give up arguing at this point and concentrate on the loose
ends of Justin's proposal.

I just want to keep the point in mind, that \mathsf is the prescribed
font for tensors in mathematical formulae e. g. by the IUPAP (International
Union of Pure and Applied Physicists) recommendations. And it is natural to
name some tensors by greek letters (not necessarily confined to uppercase).

--J"org Knappen