@anderslund Maybe it's easier to show an (abstracted) person performing the sport, like in https://wiki.openstreetmap.org/wiki/File:Curling-borderless.svg and many of the examples in https://wiki.openstreetmap.org/wiki/Category:Sport_icons ?

@anderslund Can any other distinguishing characteristics be added without resorting to too fine details? As shown on the map, I might not even recognize the current proposal as an icon and might mistake it for a map feature with that geometry.

@anderslund Ah, so not generally for any arbitrary «group of sports» (such as a an area usable for both basketball and street-hockey), but for specifically the group of related-to-each-other ball-throwing sports that are boules-like.

For those, it'd be good if the balls were represented by actual circles/disks, rather than circle-similar-but-not-perfectly-round blobs. And maybe give the big disks some inside lines, similar to the markings the actual balls sometimes have: https://en.wikipedia.org/wiki/File:Bocce_set2.jpg

@anderslund I don't even understand the word. What's a «grop»? (Or did you just mistype «group», i.e., it's about areas or amenities usable for several distinct sports?)