ENTER↑ is a misnomer, long live ENTER:

[Raymond Del Tondo]

(07-06-2014 04:38 PM)Katie Wasserman Wrote:  I mostly agree, but just assume have a big, unlabeled key in a different color from all the rest.

That's it. The up-arrow vanished more than a quarter of a century ago, and nearly everyone still found the ENTER/INPUT key, even on an HP-32S or HP-42S:-)

It was clearly distinctable from the other keys, and the manual told how to use it.

The up-arrow was ok in the early years, when HP thought people would need this kind of additional mnemonic. Nowadays the up-arrow would only be a reminiscence to the past.

The colon could be misleading, so better simply omit it.
Keep it simple, keep it ENTER;-)