1) NASA spaceplane 2) Single sign on 
[rite] The Sso was an initiation rite practiced by the Beti of Cameroon in the 19th and early 20th centuries. The participants were young men between 15 and 25 years of age who, by completing the rite, became adults and enjoyed added privileges, such as passage into the land of the ancestors at death. Each boy was sponsored by an esia Sso (...
Senior Safety Officer
Sun-Synchronous Orbit.
Society of Surgical Oncology
Single Sign On
Station Staff Officer
Suspended Sentence Order