Term: Action
An act of doing, or starting, something. Everything in combat, and some things during exploration or socialization, takes actions. All creatures have a set amount of actions that refreshes every Round ( 6-10 seconds, but not always). All Actions have symbols associated with them.
All creatures have 3 Standard Actions (◆-◆◆◆), 1 ReAction (⮌), a set amount of Movement ( X►, ex: 10 ft of movement = 10►), and an infinite number of free actions (◇).
The full rules text can be found at Rule: Action Economy