Most common:
* Spinal Cord Injury: This is the most likely meaning if you are talking about medical or health-related topics.
Other possibilities:
* Scientific Computing Initiative: This is a research initiative focused on the development and application of scientific computing.
* Società Canottieri Italia: This is the name of a rowing club in Italy.
* Software Configuration Item: This refers to a specific component or element within a software system.
* School of Continuing and International Education: This is a name for a department or program in some universities.
To figure out the correct meaning, you need more context:
* What is the topic of discussion?
* What kind of document are you reading?
* What are the surrounding words?
For example, if you are reading an article about a medical condition, then SCI most likely refers to Spinal Cord Injury.