Equity volatility indicator

["Gerald Marisch" <gm@xxxxxxxxxxxxx>]

Is there a number-indicator that reflects the "volatility" of an equity?

I'm hoping there is such an number-indicator that, for instance, a number of
"10" would indicate the equity has a lot of up-and-down trends whereas as
number of "1" would indicate the equity's prices trend in a confined
horizontal channel.

If the equity has a number of "10", is there another indicator number that
would indicate HOW MUCH of a "10" there is?

For instance, consider Equity A whose price moves between 25 and 27.  This
would be a "1".

Equity B's price moves between 10 and 35.  This would be a "10" with a
"delta" of 25.

Equity C's price moves between 5 and 45.  This would be a "10" with a
"delta" of  40.

For trading, C would be better than B.  A would be good for "buy and hold".

Any answers of suggestions?

HAPPY NEW YEAR TO ALL!

Gerald Marisch