You can easily identify personnel in your team that are external to your own organization.

Prior to 22.2 Organization field automatically adopted the same value assigned to a user’s Division. Now Tenant Administrators can specify a unique value for Organization after inviting the user to a tenant.
Tenant Administrators can add this information to the new Organization field found under the user’s Job details pane accessed from Administration > Users > selected user.
Learn how to add organization to a user's descriptor.