When the word Moderato is used as an adjective, (for example; to moderate something), it means to keep something within allocated boundaries or within a pre-determined limit. Moderato can serve to moderate tempi, keeping the music from dragging or rushing.
A moderator is a person who is often the chairman at a meeting, and in some governments serves to run town meetings, making sure that the rules and conduct of the meeting are followed. Moderato does this with Tempo!
In the picture, Q is propelling his scooter, MODERATO. Moderato has a relaxed comfortable speed and when added to other tempi, it helps keep them under control. Easy does it, Q!
