Apple Symbols is a font introduced in Mac OS X 10.3 “Panther”.
This is a TrueType font intended to provide coverage for characters defined as symbols in the Unicode Standard.
It continues to ship with Mac OS X as part of the default installation.
From Mac OS X 10.5 onward, it is to be found at /System/Library/Fonts/Apple Symbols.ttf, meaning it is now considered an essential part of the system software, not to be deleted by users.
As well as additions to the Unicode blocks partially covered by earlier releases, the font included new glyphs for Latin, Greek, Shavian, and the following Unicode blocks: