How to create keyboard shortcut for special characters?

If you are using the US keyboard type Option+6 to get the section symbol. Option+7 produces the pilcrow.

Access to the mathematical logic symbols is from the Pages > Edit > Special Characters .... menu. This launches the Character Viewer and there is a category for Math Symbols. Double-click any symbol and it will appear at the last cursor position in Pages.

nickbyrd wrote:

(mathematical logic symbols)

If you need a shortcut for those, try Pages > Preferences > Autocorrection >Symbol and Text Substitution

Productivity is a terrible thing to waste. Glad to help and thank you.