Construct an NSBezierPath
with the outline of the glyph, and then fill/stroke the path into your graphics context.
NSFont *font = [NSFont fontWithName:@"Apple Symbols" size:12.0];
NSBezierPath *path = [NSBezierPath bezierPath];
[path appendBezierPathWithGlyph:[font glyphWithName:@"gid5002"]
inFont:font];
// ...
[path stroke];