___ Lion, 3 letters
Common Apple platform, 3 letters
It comes pre-installed on most Macs, 3 letters
It runs on a Mac, 3 letters
It ships with Macs, 3 letters
It ships with most Apples, 3 letters
Mac interface, 3 letters
Mac platform, 3 letters
Macintosh platform named 'Leopard', 3 letters
Modern Apple platform, 3 letters
Modern Mac interface, 3 letters
Platform with versions named after cats, 3 letters
Snow Leopard, e.g., 3 letters
What Macs ship with, 3 letters