The ❂ character seems to trigger local search results in Google.com:

The character resembles the 'crosshairs' graphic associated with maps and navigation.

According to Wolfram Alpha, this symbol is "circled open centre eight pointed star".

The HTML character entity for this Unicode character is ❂ ❂ or ❂ ❂ and it is part of Unicode's Dingbats group.

Interestingly, Google did not choose the position indicator (⌖ ⌖ or ⌖ ⌖).