Terms & Abbreviations: S
- S-II
Second stage of a Saturn V rocket.
- S-IVB
The second stage of a Saturn IB or the third stage of a Saturn V.
- Sears, Norman E.
Member of the MIT Instrumentation Lab
- SIVB
See S-IVB
- SPS
Service Propulsion System, the large engine of the Service Module that was used to enter and exit lunar orbit, as well as make course corrections while going to and from the moon.