Apple calendar 'wireless' icon next to secondary Gmail account calendars I have added my primary Gmail account to Calendar.  This primary account has a few associated calendars associated with it.  On the right hand side of Calendar under the Google heading, my primary Gmail account and its associated calendars appear, but the associated calendars have what looks like a cell phone wifi indicator turned at a 45 degree angle to the right to the right of them. 

Any idea what this is?

 

Using Calendar version 6.0 (1648).
This indicates a shared calendar.