"Larry Jaques" wrote in message
...
On 15 Nov 2016 03:01:39 GMT, "DoN. Nichols"

wrote:

On 2016-11-14, Larry Jaques
wrote:
On 14 Nov 2016 03:11:36 GMT, "DoN. Nichols"

wrote:

[ ... ]

Yep -- 80=90 VAC 20 Hz (or 20 CPS in the old days. :-)

Yeah, I grew up with Cycles Per Second, too.

Or -- for short, '~' on some date plates. :-)

Right. I had forgotten those. That's probably how it ended up on
the
QWERTY keyboard in the first place. I use it now to approximate.

https://en.wikipedia.org/wiki/Tilde