One of the two first patch markings, at that time they were called plant markings because they had their own items made for them, the Rings plant and War Paint plant(also called flowers). They have been removed from the marking shop, and since it wasn't put on an existing item, it cannot be found while gathering, but there are rumors of the two plants being released to the wilds soon so they can be found later. Because these two were Plant markings and the first of their type, they had a (P) by their name. Now, even though the new markings arent plants, but Patches, the (P) has stayed.
Rings is unmistakeable on any feli, and can be considered a large marking just because of how much space it takes up. Though if the ring part of the feli is covered, the legs could possibly be mistaken for boots, but it's very unlikely.