If it's confusing no one will bother clicking on it. DON'T use clever, made-up words. DON'T use single characters for keywords. Every time someone searches for hints , our site would then be in that list of results. You'll get more hits and this new audience just may be geared toward possibly using your service too.
Many search engines scan only the first few hundred words in determining relevance of keywords.
Also position these near the the top of your page. Many search engines place a more emphasis in the words found in headings and titles in determining the relevance of keywords. Also position these near the the top of your page. This helps search engines concentrating on search engine results. It helps with results and position for the key search engines.