ceremonial sword
A sword used for formal ceremonies, not for combat. Often decorative or symbolic.
Ceremonial swords are often used in formal ceremonies.
I saw a beautiful ceremonial sword at the museum.
Compound of 儀礼 (ぎれい, 'ceremony, etiquette') and 刀 (とう, 'sword'). The exact historical derivation is uncertain, but the term straightforwardly describes a sword for ceremonial use.