The Mercury Harp is a stringed instrument wielded by Sailor Mercury in the manga and the Crystal anime. She plays it to unleash her Mercury Aqua Rhapsody attack, and though it carries the name harp, its shape leans closer to a lyre, the instrument linked in myth to Hermes.
This delicate stringed weapon appears with Sailor Mercury in the manga and in Sailor Moon Crystal. Its purpose is offensive, channeling her power into the assault called Mercury Aqua Rhapsody. The title is a bit of a misnomer, as the frame more closely matches a lyre than a true harp.
Ami gains the harp in the manga after Guardian Mercury frees her from a nightmare during the Dream storyline. She uses it to perform Mercury Aqua Rhapsody against her foes. In common with the instruments the other inner guardians receive, the harp holds a mind of its own and can speak with its owner, though the story reveals that trait only a single time.

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Sailor Mercury's weapon in the manga and Sailor Moon Crystal is the Mercury Harp, a stringed instrument she plays to unleash her Mercury Aqua Rhapsody attack.
Not quite. Despite its name, the Mercury Harp's frame more closely resembles a lyre than a true harp.
Ami Mizuno gains the Mercury Harp in the manga after Guardian Mercury frees her from a nightmare during the Dream storyline.
Yes, like the instruments given to the other inner guardians, the Mercury Harp holds a mind of its own and can speak with Ami, though this happens only once in the story.
The Mercury Harp's lyre like design nods to Hermes, the Greek messenger god whose Roman counterpart lends Mercury its name.
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