Tips for searching Google for

Tips for searching Google for special characters like #, +, and so on.

Even more interesting is the way Google handles the "+" character.
Google will find words of any length followed by any number of +
characters. This means you can find "A+", "C++", even "plus++++".
Words with + in the middle of them, such as "a+++b" will treat the
last + as a space and find "a++ b". +'s at the beginning of a word
are ignored, so "++x" is the same as a search for "x".

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(via Robot Wisdom)