What is "brisingamen"

In Norse mythology, Brísingamen (or Brísinga men) is the torc or necklace of the goddess Freyja. The name is an Old Norse compound brísinga-men whose second element is men "(ornamental) neck-ring (of precious metal), torc". The etymology of the first element is uncertain. It has been derived from Old Norse brísingr, a poetic term for "fire" or "amber" mentioned in the anonymous versified word-lists (þulur) appended to many manuscripts of the Prose Edda, making Brísingamen "gleaming torc", "sunny torc", or the like. However, Brísingr can also be an ethnonym, in which case Brísinga men is "torque of the Brísings"; the Old English parallel in Beowulf supports this derivation, though who the Brísings (Old Norse Brísingar) may have been remains unknown.