But what should we call them?

[MarkHR]

In an ideal world (mine own):

Aa, Ab, Ac, Ad, Ae
Ba, Bb, Bc,....etc.

Unfortunately, it's not ideal as most of those minimal combinations went right after launch. So I make do with what I can (Wq, Kr, Ps, Hn, Oa :/ )

edit: not nearly as fun and as imaginative as Vicker's (needs a few more additions though such as three stooges, goon show, monty python, famous band members, e.g., pete, eric, jimi, janice, robert)