The Chick-fil-A logo incorporates a chicken into the "C." Although this isn't very hidden, it is still pretty clever, more so than their attempts to have people believe that their meals are nutritious.
NBC
Considering they're often referred to as "the Peacock Network," among other things, this one is rather obvious. But the symbolism of the colored feathers represent each division of NBC (from when the logo was first designed, as there are more now) and the head of the peacock is looking right, meant to symbolize looking forward (to a show that can compete with "Mad Men" and "Modern Family.")