Clicking that icon will turn it into a bigger blue pin, ... After you have dropped a pin on Google Maps, open up the location description and tap Share. Adam Birney / Android Authority.

Long press on the location to drop a pin. Google Maps will indicate the pinned location with a red pin icon. Tap on it, and you’ll see an information card with more details about the location.

Google is testing showing blue map pins and gray map icons in the search listings. Sergey posted on Twitter a screen shot of a Google Maps result set that shows a blue pin instead of the red pin.