create these characters yourself, hold "alt" down and
type the numbers in on the right side of the keyboard (num pad) then
let go of the buttons and the character will appear. This is a
great way to experiment with new symbols, signs and characters, and
it's also good if a button or letter on your keyboard stops working,
because you can still type it using the num pad. Just look down the
list to find your letter.
You may also be interested in a much smaller, but more rare list of special
ascii characters for text art.
Some of the symbols have been listed in bold to separate them clearly from their descriptions.