[tumblindice]

It looks like a strigil.
The Romans didn’t know about soap and water. After a strenuous workout in the arena they would slather themselves with oil, then scrape off the dirt, sweat and oil with a curved strigil.
She’s getting ready to squeegee herself.

[tumblindice]

PS Most likely she was one of the scantily clad gals that paraded around the arena holding up cards showing the rounds in numerals (Roman, of course).

[Nervous Tick]

>> After a strenuous workout in the arena they would slather themselves with oil, then scrape off the dirt, sweat and oil with a curved strigil.

Now that there is capital-A *Arcane* knowledge.