OneNote contains features such as Equations and Symbols. The Equation feature is used to add math equations to the page, and the purpose of the Symbol is to add symbols. The Equation and Symbol feature contains various equations and symbols you can choose from to add to your page.
What are the Equation and Symbol features in OneNote
Equation: Add a common mathematical equation to your documents, such as the area of a circle or the quadratic formula. You can also build your equations using the library of math symbols and structure.
Symbols: Add symbols to your document that is not on the keyboard. You can choose a variety of symbols such as mathematical, currency, and copyright symbols.