Federated user

• https://aws.amazon.com/blogs/security/how-to-easily-identify-your-federated-users-by-using-aws-cloudtrail/

arn:aws:sts::0123456789012:federated-user/user-name
https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_identifiers.html

• Federation
• userarn, Federated user