How to Make Math Symbols on Your Mac (OS X)

Using the Keyboard Viewer App on the Apple Menu bar

1. 
   Look for the following icon on the topmost menu bar with the Finder active:.

   1. Click on it and hold the mouse button down.
   2. Scroll down to "Show Keyboard Viewer".
2. 
   Choose from the special key options also available when holding the Option, Command. Control and Shift keys, and combinations thereof.
3. 
   Holding down the Shift and Option keys and selecting the k key, you can obtain the "" apple symbol icon key for example.
4. 
   Hold down the Option and p keys to obtain the "π" pi symbol icon key.

   1. Other keys that are available this way in option pairs are the + ±, = ≠, < ¯, > ˘, ? ¿, d ∂, f ƒ, w ∑, j ∆ ,key-pairs etc. Also of use is the Null set, {ø}, available from the o key and option or Shift+Option = Ø. The degrees symbol is useful in trigonometry, from the zero key and option: 0º, or 90º ... and for temperatures of course.
   2. Final Image: