Transverse canal, that joins longitudinal Haversian canals is known as Volkmann's canal. It is a characteristic feature of the bone of a rabbit.

Explanation:
The transverse canal that connects the Haversian canals is called Volkmann's canal. These canals are present in the compact bone of mammals, including rabbits. Volkmann's canals are responsible for connecting the Haversian canals, which are the central canals of the osteons.

Structure of Compact Bone:
The compact bone, also known as cortical bone, is one of the two types of bone tissue found in the skeletal system. It forms the outer layer of most bones and provides strength and support. The compact bone is composed of repeating units called osteons or Haversian systems.

The osteon is a cylindrical structure consisting of concentric layers of bone tissue called lamellae. Each lamella is arranged around a central canal known as the Haversian canal. The Haversian canal contains blood vessels, nerves, and connective tissue.

Volkmann's Canals:
Volkmann's canals are perpendicular canals that connect the Haversian canals. They allow blood vessels, nerves, and connective tissue to travel from the periosteum (outer layer of the bone) to the Haversian canals. These canals play a crucial role in the vascularization and innervation of the bone.

Characteristic Feature in Rabbit Bone:
The question specifically mentions that Volkmann's canals are a characteristic feature of the bone of a rabbit. This means that rabbits have a well-developed network of Volkmann's canals that connect the Haversian canals. This network ensures efficient blood supply and communication between different parts of the bone.

Conclusion:
In summary, Volkmann's canals are transverse canals that connect the Haversian canals in the compact bone. They allow for the passage of blood vessels, nerves, and connective tissue. In the bone of a rabbit, Volkmann's canals are a characteristic feature that contributes to the vascularization and innervation of the bone.