Wikipedia page ranks as the top link for for the following punctuation marks.

• ^ (caret)
• ( ) { } [ ] (bracket) – parentheses, brackets and curly brackets are all combined into the same search result
• ~ (tilde)
• | (vertical bar)
• “ (quotation marks)
• < (less-than sign) > (greater-than sign)
• $ (dollar sign)
• . (full stop/period)
• , (comma)
• : (colon) – however, the colon that is a piece of the large intestine currently outranks the punctuation mark of the same name
• ; (semicolon)
• # (number sign)
• % (percent sign)
• @ (at sign)

These punctuation marks in Yahoo and Bing diplays “No results found” to the user.