mathematical symbols

For Objective-C: You have to use the Unicode escape sequences. Expand the Emoji selector into the window and you'll see the Unicode sequence for each character. So for a happy face, you see the code U+1F603. Type \u1F603 and it will transform into the emoji at runtime.

For Swift, you can just put the emoji right into the code.

I'm not sure if you already know this or you'll find this as helpful as on Word...

Open System Preferences>Keyboard, and check both the followings:

- Show Input menu in menu bar [Input Souces]

- Show Keyboard & Character Viewers in menu bar [Keyboard]

Show Character Viewer form the Input menu in the menu bar, and select Math Symbols.

Double-click any of the characters while an editor is active, and you can input Math Symbol characters:

×÷±∓∩∪⋯