- spheroidal
- spheroidal hypercylinder
- spherometer
- spill process
- spin
- spin box
- spinner control
- spinning
- spike
- spike driver
- spike-free
- spill area
- spillway channel
- spin representation
- spindle
- spindle control
- spindle-flange
- spine function
- spinode
- spinor algebra
- spinor group
- spiral flow
- spiral point
- spiral surface
- spire
- spitter wall
- splice loss
- splicing-pit
- split anode
- split box
- Split Cells
- split ring
- split table
- split window
- splitter
- splitting homomorphism
- spoke shave
- spontaneous fission
- spooling device
- spot
- spot beam
- spout
- spread angle
- spread spectrum
- spreadsheet area
- spreadsheet setting
- spreadsheet software
- spring balance
- spring beam
- sprite
- sprocket
- sprocket bit
- spurious modulation
- spurious periodicity
- squarability
- square
- square bracket
- square lattice
- square pitch
- square pulse
- square rooted
- square rooting
- squarience
- squaring
- splice number
- splice plate
- splicing tape
- spline
- split
- split bar
- split screen
- splittable
- splitting field
- spontaneous combustion
- spontaneous emission
- spool
- spot color
- spot level
- spot punch
- SSCP services
- stab stepping
- stability
- stable
- stable algorithm
- stable completion
- stable component
- stable element
- stable subgroup
- stack address
- stack architecture
- stack buffer
- stack indicator
- stack pointer
- stack storage
- stack trace
- stacked job
- stacker
- staging disc
- staging library
- stagnation point