I have no idea why "pound sign" gets announced sometimes while "number" gets announced others, but they're the same thing.
I was thrown the first time I heard someone refer to '#' as the pound sign rather than the number sign. Now, of course, we have "hashtag" to add to the mix.
Brian - Windows 10 Home, 64-Bit, Version 1803, Build 17134
A little kindness from person to person is better than a vast love for all humankind.
~ Richard Dehmel