Different icon for wifi 2.4ghz, wifi 5ghz and wifi guest

[giustanca]

Before submitting a new icon request, please confirm the following:

• [x] I have searched all issues to make sure there isn't a request for this icon.
• [x] I have searched the current library to make sure the icon doesn't already exist.
• [x] I understand that brand icons are no longer being added and I can use SimpleIcons for my brand icon needs.
• [x] I only intend to request a single icon (or a few near-identical ones) in this issue.

What would you use this icon for?

It would be useful to have different icons to identify different wifi networks, first of all to differentiate the 2.4ghz wifi from the 5ghz one. It would also be useful to have an icon for the guest wifi.

Give us an example of what this icon might look like.

the simple wifi icon with the wifi type written on the right: 2.4ghz, 5ghz, guest