Is arb proof of stake?

Could you please clarify for me if arbitration, or arb, is a form of proof of stake? I've been reading about various consensus mechanisms in the blockchain space and I'm trying to understand the nuances between them. Proof of stake seems to be a popular one, but I'm not sure if arbitration falls into this category. Could you explain the relationship, if any, between arbitration and proof of stake? Also, if arbitration isn't a type of proof of stake, could you provide an example of what arbitration typically refers to in the context of cryptocurrency and finance? Thank you for your help!