Hi Gail,
These two help articles from our Knowledge Base should answer all your questions about on-screen icons.
Activity icons: http://help9.striiv.com/support/solutions/articles/3000035819-what-does-the-fusion-track-
Apps menu icons: http://help9.striiv.com/support/solutions/articles/3000020316-how-do-i-turn-on-and-navigate-through-my-fusion-
Gail Phillips
jUST RECEIVED MY STRIIV FUSION. wHAT DO THE SCREEN ICONS STAND FOR. i SEE THE FEET (MEANING STEPS TAKEN i ASSUME). WHAT ABOUT THE OTHERS?