I didn't know that: until recently, Google ignored all punctuation symbols when indexing sites, which also meant they were ignored in searches. That has now changed, with seven common punctuation marks indexed by Google.
The seven punctuation marks which Google is now indexing are:
- The percentage sign %
- The dollar sign $
- The forward slash \
- The full stop .
- The at symbol @
- The hash symbol #
- The plus sign +
That change follows a switch last October which meant that the plus sign could no longer be used to force Google to only show results including that term. (If you want to do that now, you have to use quotation marks around the term instead.)
Search quality highlights: 50 changes for March [Inside Search]