Katoptris

Katoptris (meaning looking glass in Greek; καθρέπτς) is Piper McLean's dagger and her primary weapon. Piper finds and chooses it when Annabeth takes her to the Armory. It is sheathed in worn, black leather and is bound in bronze. Katoptris has a hilt made of polished wood with an 18" triangular blade made from Celestial bronze. It is useful in battle and is a symbol of power and status.

History
This knife was originally a wedding present to Helen of Troy from her husband Menelaus, and when looked upon, can show much more than the holder's reflection (as shown when Piper saw her father tied to a pole by the giant, Enceladus). Helen mostly used the dagger as a mirror, which was why she called it Katoptris, which meant "mirror" or "looking glass".

Katoptris is a parazonium blade. It was mostly ceremonial, carried by high-ranking officers in the Greek armies. It showed that the wielder was a person of power and wealth, but it could be used well in a fight.

Owners

 * Helen of Troy - originally/formerly
 * Piper McLean - currently

Trivia

 * Katoptris ("Kathreptis") is Greek for Mirror or Looking Glass. Annabeth speculates that a mirror was the only thing Helen used it for.
 * Although it is considered a weapon, it was never really used in battle by Helen.
 * Piper uses it as a formidable weapon to hold off the Earthborn.
 * Piper doesn't seem to use it until the fight to free her Dad, until then she uses it as Helen did.

