The Kosmos general purpose rules page does not contain any symbols for Points of Interest. Looking round some other users’ rules pages where they have included POIs, they normally hyperlink to an image stored in the openstreetmap wiki somewhere.
Is there an index of what’s available anywhere? It’s not possible to browse the image directories themselves.
I think most of the Kosmos rule pages are just copies of the Kosmos General Purpose Rules, with a few minor things changed. It looks like someone edited the general purpose rules wiki page last week, removing most of the details for POI and icons etc, I don’t know why (check the history).