Overview
A rosette is a rose-like marking or formation found on the fur and skin of some animals, particularly cats. Rosettes are used to camouflage the animal, either as a defense mechanism or as a stalking tool. Predators use their rosettes to simulate the different shifting of shadows and shade, helping the animals to remain hidden from their prey. Rosettes can be grouped in clusters around other spots, or may appear as blotches on the fur.
Leopard
The leopard (Panthera pardus) has a wide variety of coat coloration. On each color variation, the leopard has rosette patterns on their backs, flanks, and limbs. They also have patterns that are considered to be spots and not rosettes on their heads, stomach, and limbs.
Jaguar
Like the leopard, the jaguar (Panthera onca) has a wide variety of coat coloration. The jaguar can have a coat in colors ranging from white to black with the most common residing in brownish yellow area. These big cats have rosettes on their bodies in random combination and pattern.
From Wikipedia (CC BY-SA 4.0).