Star of Life
The Star of Life is a symbol used to identify emergency medical services. It features a blue six-pointed star, outlined by a white border. The middle contains a Rod of Asclepius – an ancient symbol of medicine. Wikipedia
In Unicode: U+2695 ⚕ STAFF OF AESCULAPIUS
See also: U+2731 ✱ HEAVY ASTERISK; U+1F7BA 🞺 EXTREMELY HEAVY SIX SPOKED ASTERISK