Consider labeling the trinity Icons.

The input comes form a support case: SUPPORT-4663

Summarized (for more details see support case):
For beginners of the system it is quite unclear, what the trinity icons are for.

For us experienced Magnolia users its very clear, not even thinking about that one might not understand directly.
But test with new authors show from client side, that quite a lot are confused at the beginning about their meaning.