The Piano Forest logo may look like a simple text logo with trees above it, but if you take another look you will see that the trees actually represent keys on a piano.

The NBC has a hidden peacock above the text which is looking to the right, this represents the companies motto to look forward and not back and also that they are proud of the programs they broadcast 

In the negative space either side of the tree there is a lion and a gorilla this shows that it is for a zoo.

The negative space between the E and the X forms a arrow
this shows that the company has a fast delivery service.

Big 10 conference has 11 school but they didn't want to change there name so the used the T to make the figure 11 in there logo.

Toblerone logo.

Toblerone came form Switzerland which was nicknamed "city of bears",
If you look carefully you can see the outline of a bear in the logo.