The pi symbol isn't readily available on your iPhone's default keyboard, but there are tricks you can do to change that and have it available whenever you need.

Here's how you can start using Math Notes in the Calculator app in iOS 18: Open the Calculator app on your iPhone. Tap the calculator symbol at the bottom left of the screen.

Using symbols When comparing numbers, you can use words such as 'greater than' and 'less than'. However, it is sometimes easier to use a symbol than writing words.

Math Notes is a feature that allows you to crunch numbers in certain apps on your iPhone, iPad, and Mac. You can use it for study, for work, or for personal use anywhere you need to do anything ...