The leopard or lion passant guardant is a frequently used charge

Charge (heraldry)

In heraldry, a charge is any emblem or device occupying the field of an escutcheon . This may be a geometric design or a symbolic representation of a person, animal, plant, object or other device...

 in heraldry

Heraldry

Heraldry is the profession, study, or art of creating, granting, and blazoning arms and ruling on questions of rank or protocol, as exercised by an officer of arms. Heraldry comes from Anglo-Norman herald, from the Germanic compound harja-waldaz, "army commander"...

. It mostly appears in groups of three, which are positioned over each another.
The heraldic leopard differs from the real-life leopard

Leopard

The leopard , Panthera pardus, is a member of the Felidae family and the smallest of the four "big cats" in the genus Panthera, the other three being the tiger, lion, and jaguar. The leopard was once distributed across eastern and southern Asia and Africa, from Siberia to South Africa, but its...

 (Panthera pardus). It does not have any spots and often has a mane

Mane

- Biology :* mane of a horse, the line of hair along the spine of the neck* mane of a lion, found around the male mammal's neck- Places :* Mane Department, a department in the Sanmatenga Province of Burkina Faso* French communes:...

. In heraldry, the leopard is also generally similar to a lion. The reason for this lies in the fact that in the Middle Ages

Middle Ages

The Middle Ages is a periodization of European history from the 5th century to the 15th century. The Middle Ages follows the fall of the Western Roman Empire in 476 and precedes the Early Modern Era. It is the middle period of a three-period division of Western history: Classic, Medieval and Modern...

 leopards were thought to be a crossbreed

Crossbreed

A crossbreed or crossbred usually refers to an animal with purebred parents of two different breeds, varieties, or populations. Crossbreeding refers to the process of breeding such an animal, often with the intention to create offspring that share the traits of both parent lineages, or producing...

 between a lion and a panther.