SMT  (.1.).Aileron/Rudder.Servo.Mount.. 
(.2.).Elevator.Servo.Mount.. 
(.3.).Servo.Mount.. 
(.4.).Stabilizer.Trim.Servo.Mount.. 
(.5.).Standard.Message.Text.. 
(.6.).Station.Management.. 
(.7.).System.Maintenance.Task 
SN  Subnetwork 
SNA  System.Network.Architecture 
SNAC  Subnetwork.Access 
SNAcP  Subnetwork.Access.Protocol 
SNCR  Subnetwork.Connection.Reference 
SNDCF  Subnetwork.Dependent.Convergence.Function 
SNDCP  Subnetwork.Dependent.Convergence.Protocol 
SNICF  Subnetwork.Independent.Convergence.Function 
SNLE  Subnetwork.Link.Establishment 
SNMP  Simple.Network.Management.Protocol 
SNPA  Subnetwork.Point.of.Attachment 
SNPDU  Subnetwork.Protocol.Data.Unit 
SNR  Signal-to-Noise.Ratio 
SNSDU  Subnetwork.Service.Data.Unit 
SOF  Safety Of Flight 
SOH  Start.of.Header 
SOI  System Operator Instructions 
SOIT  Satellite Operational Implementation Team 
SOM  Software Operator Manual 
SON  Statement of Operational Need 
SOP  Standard Operating Procedure 
SOPA  Standard Operating Procedure Amplified 
SOS  Silicon On Sapphire 
SOW  Statement Of Work 
SP  Space 
SPATE  Special Purpose Automatic Test Equipment 

SPC  Statistical.Process.Control 
SPD  Speed 
SPE  Seller Purchased Equipment 
Speed of Light  Represented.by.the.symbol.c.and.has.a.value.. 
of.2.9979250.x.108.meters/second.or. 
983,571,194.feet/second. 
SPI  Special Position Identification 
SPIP  Designation.for.a.transponder.ident.pulse. 
SPKR  Speaker 
SPM  (.1.).Stabilizer.Position.Modules.. 
(.2.).Surface.Position.Monitor.. 
(.3.).Support.Plan.Manager 
Spoking  Refers.to.a.display.presentation.that.radiates. 
outward.from.the.display.origin.like.the.spokes.on. 
a.wagon.wheel. 
SPR  Sync.Phase.Reversal..(Term.is.used.in.Mode.S. 
transponders.) 
SPS  (.1.).Sensor.Processing.Subsystem..