A clock.
First thing I noticed was from the rings in her NP.
A clock face, but starts with II and ends with XIII.
Then, her swords become distinct, with one is shorter than the other, representing clock hands. There're hollowed ring on each to affix them to a clock.
Minute Hand
Hour Hand
The hands allusion is apparent in certain attack animation, where she combined both swords to form a dragon's jaw.
I think it's fitting, given that Clock Tower is built atop Albion's Spirit Tomb. She can be seen as its very foundation.