Right click an unused area of the menu bar and select
customize. Select the commands tab. In the Categories
window select Insert. In the commands window scroll until
you find the Symbol command. Drag and drop on your insert
menu.
You accidently activated the terminator hyphen with
CTRL+ALT+Hyphen key. This thick black hyphen terminates
menu commands. Press ESC to kill it.
-----Original Message-----
My cursor turned into a giant minus sign, and when I went
to the insert menu to choose symbol it went away. Now the
option to insert a symbol on the insert menu is completely
gone. How can I get it back?