Celtics Memoribilia

[summernights]

Hello all, I found this old keychain with my father's belongings:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=121378384000

he was the biggest Celtics fan, I'm trying to raise money to support the family after his passing

I'm not sure what it is, or if I've described it well.  I'm assuming that the stars signify the number of world championships?  Any help would be appreciated.  Thanks for your help!