Compact bone has columns of tissue called?

Haversian system or Osteon

Explanation:

The cylindrical shaped units present in compact bones are called Haversian systems. Also called as osteon, each Haversian system has a matrix in the form of thin layers. These thin layers of the matrix are called lamellae and are arranged in concentric layers called central canals. The space between the lamellae of each osteon is occupied by osteocytes.