I just tried searching by # on facebook, and I guess it could be useful. But I don't see why there has to be a hash. Google can search the internet without search terms having to have a # on them. This seems a backwards step. I certainly can't be bothered selecting words that I feel are important every time I post to Facebook.
As for Twitter, that reminds me of using DOS. Where is the interface? It's just unconnected sentences from people with no threading or anything.
You did ask "What do *Americans* call this sign? #"
As far as I know,just like bob_villain said, we mostly call it either a
pound sign or number sign in general use. Although, twitter uses the
sign for their own purposes, I suppose that's become common place, too.
The use of '#' for "number" (No.) and "pound" (lb., lbf.) is a hack.
I have a friend who uses &c. as well!
U+20AC 0128 euro
U+00A2 0162 cents
U+00A3 0163 pound sterling
U+00A4 0164 generic currency
U+00A5 0165 japanese yen
I've got a little utility that pops up code tables so I can cut and paste
"characters" directly from that into <whatever>.
You can also install a Unicode font (e.g., CyberBit) and look at
the font displayed...
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