Notability: Typing Math and Science Symbols
1. Open Settings.
2. Select General then Keyboard then Text Replacement.
3. Tap the Plus button in the top right corner.
4. In the Phrase row, type or paste a symbol, such as "²".
5. In the Shortcut row, type or paste a shortcut, such as "^2".
6. Tap Save in the top right corner.