The term 'Collection of Old Norse Poetry' can be summarized as the Edda, a four-letter word. The Edda is a collection of Old Norse poems and stories from the 13th century. It is an important source of information about Norse mythology, containing stories of gods and heroes, as well as traditional Norse poetry. The Edda is divided into two parts: the Poetic Edda, which contains mythological and heroic poems, and the Prose Edda, which contains stories about Norse gods and goddesses.