What is a search operator?
A search operator command you use when performing your search. Search engines have been using these ever since they came into existence. For example, if you go to search.yahoo.com and search for the term computer, you will see Wikipedia results. If you did not want to see Wikipedia results, you type in your search as computer -wikipedia. The minus sign followed by the word means “don’t show this”. Using mail search operators in Yahoo! Mail This is an undocumented feature of Y! Mail, but you can use these right now.