Welcome to the symbology and sigils forum where you can discuss all manners of symbols and their uses / meanings.
I wanted to start with this one mainly because it will protect from any others posted that may not be particularly friendly. It's a basic and easy to use sigil and I advise all Seekers to commit it to memory.
Magic Circle List
Symbology Master List
Script Master list
Runes Germanic
Sheikah (Zelda BOTW)