On Garmin Connect Mobile, when I select "Elliptical" as an activity type, the appropriate icon shows up:
However, in the online activity, both in Calendar and Detail View, it just uses the generic weights icon:
Example: https://connect.garmin.com/modern/activity/1123222021
Also, it would be great to see icon support for some more popular activities like Yoga as requested in New Activity Type - Yoga. There must be millions more people that do Yoga daily than a whole host of other dedicated activity types like 'wingsuit flying' and 'motorcross'