I doubt anyone will take me up on this before I go ahead and give it a shot, but I really want an icon as follows. You know those "Jesus-fish" things? Take one (pointing left as they usually do), blunt the nose so it's rounded like a stylized Greek letter alpha, and inside instead of "Jesus" or "YHWH" or something, put "6563". For design purposes, you could also include an "H" outside and left of the fish/alpha, and could include to the right of the number 6563 an Å (Angstrom symbol, A with a little circle over the top of the peak).
And if you get that, you're an astrogeek like me! If not, I'd be glad to explain. :-P