I was wondering if there are fonts that use keyboard symbols and numbers to replace letters for example using a symbols like this
?2(47@(% and you get word

Can you explain better, please ?

meaning
for example
you have these keyboard symbols
!"#$%&/()= and numbers that correspond to alphabet abcd

Still don't get it...

What it wants is a font where the letters are under the !@#$%^&*()_+ etc. keys so that it can make text that can only - easily - be read when that font is installed. Child's play.

If you want just hide a text with some different types, you can use a Symbol Font like some of this ones :
http://www.dafont.com/theme.php?cat=721&fpp=50
http://www.dafont.com/theme.php?cat=710&fpp=50