arn
The ARN of the entity that the policy is attached to. The ARN format depends on the policy type:
For identity, session, and permissions boundary policies, this is the principal ARN (for example, an IAM role or user ARN).
For resource-based policies, this is the resource ARN.
For organization control policies (SCPs and RCPs), this is the AWS Organizations ARN of the account, organizational unit, or root.