Editing SSI (section)

==Science and technology==
* [[Soil-structure interaction]], the interaction between soil and structures (e.g. buildings), especially in seismic engineering
* [[Solid State Interlocking]], the brand name of a railway signalling system developed in the 1980s in the UK
* [[Solid state ionics]], the study of ionic-electronic and ionic conductors (solid electrolytes) and their uses
* [[SteadyShot Inside]], a sensor-based camera image stabilization system by Sony

===Computing===
* [[Serializable snapshot isolation]], a way to allow multiple concurrent transactions to see consistent information when making changes to a database
* [[Server Side Includes]], a server-side scripting language used on the Web
* [[Self-sovereign identity]], the user has a means of generating and controlling unique identifiers as well as some facility to store identity data.
* [[Shared Source Initiative]], a source-available software licensing scheme by Microsoft
* [[Simple Sensor Interface protocol]], a simple communications protocol designed for smart sensors
* [[Single sign-in]], a specialized form of software authentication
* [[Single system image]], a cluster dedicated operating system
* [[Small-scale integration]], a type of integrated circuit
* [[Synchronous Serial Interface]], a serial interface standard for industrial applications

===Medicine===
* [[Stress–strain index]], a measure of bone strength
* [[Surgical site infection]]
* [[Sliding scale insulin]], fast- or rapid-acting insulin only given subcutaneously