Full Title or Meme
Native SSO allows sharing of Single Sign-On among native apps from the same vendor.
OpenID Foundation (draft) standard OpenID Connect Native SSO for Mobile Apps 1.0
OpenID Connect 1.0 is a simple identity layer on top of the OAuth 2.0 protocol. It enables Clients to verify the identity of the End-User based on the authentication performed by an Authorization Server, as well as to obtain basic profile information about the End-User in an interoperable and REST-like manner.
The document describes a mechanism that allows a mobile app to share the identity/authentication obtained by a different mobile app where both apps are written by the same vendor.