Acadly uses colors to point out the activities you should pay attention to. Colors hold different meaning in a course depending on your role.
In general, the idea behind colored icons is as follows -
Red: Requires immediate attention
Blue: Requires attention but is not urgent
Pink: Future activity that require imminent attention
Grey: Can be ignored
Green: Happening now
For Course Team members specifically, the colors can be explained as follows:
Red Activity Icon: Denotes an unpublished activity type
Grey Activity Icon: All the activities of this kind have been published
Green Activity Icon: Activities that have been published in a lecture that is in session