Olecranon n. : The large process at the proximal end of the ulna which projects behind the articulation with the humerus and forms the bony prominence of the elbow.

Example:
Name a bone on which the following structure is located on Olecranon process?

Taxonomy
Bones, ulna, olecranon fossa, free encyclopedia, elbow-joint, ligament, left forearm, upper extremity, body, superior surface, borders, fossae, tubercles, proximal, ulnar collateral ligament, search, Lateral aspect, eminence.

Defination from the web:
olecranon) ... ulna: upper extremity (tuberosity, olecranon, coronoid process, radial notch, trochlear notch) – body – lower extremity (head, ...