The other one is a flame - for calories burned...
http://www8.garmin.com/manuals/webhelp/forerunner230/EN-US/GUID-97EA1540-A780-480F-BA4D-9A9E147FB225.html
https://www.dcrainmaker.com/2015/11/garmin-fr230-fr235-review.html#activity-tracker
Thanks - found it in the second link, but not the garmin manual.The manual says this about the Activity Tracking widget:
The calories are your based on your "BMR" (calories your body burns just staying alive), your calories burned during activities, and calories for just "moving around" (non "activities")