Not very amazing or technical but thought I'd post a bit about it anyways. Anyone that gets asked how to show a repeating decimal in Word, for example representing the fraction 1/3 in decimal is 1.33333333 with 3 repeating to infinity. Normally there would be a line above the last 3 (the line is called a vinculum).
Now to show the 3 with a line above it in Microsoft Word you need to use a field code that superimposes one character over the other.
Press Ctrl-F9 to insert the field delimiters then within the field code type
Now the parts of that are:
EQ - creates a scientific equation
\O - indicates to overstrike each successive element over the previous one
(3,¯) - the characters in the order to draw/type them on screen. Replace with whatever you want to combine, for example zero and a slash (0,/)
Maybe Prince was playing around with this feature when he changed his name to a symbol?
For a more detailed guide complete with screen grabs see Suzanne's posting in the list below.
Definition of repeating decimals
How to create overbars
by Word MVP Suzanne Barnhill