The term DISCOVERER'S SHOUT is a phrase used to describe the exclamation of joy and surprise when someone discovers something. It is often expressed as 'AHA!' or 'OHO!'. The term is derived from the Old English word 'AHA', which was used to express surprise or joy. The term is also used in literature, such as in the works of Shakespeare, where it is used to express a character's sudden realization or insight.