This is a token to track your chains on your Keyforge chain tracking card.
Note the tournament rules say this regarding chain tracking cards:
"Players may use only official KeyForge components in tournament play, with the following exceptions for thirdparty replacements:"
"A chain tracker card and its associated token, so long as the former is clearly legible and does not omit any information compared to the official component."
So I'd warn you against using dials and other things that aren't chain tracker cards and a token. YMMV.
Anyway, there is a circle one and an arrow one. Pick your poison.