The letter combination "SS" can have multiple meanings depending on its context. Here are some possible interpretations:
1. In the United States, SS is commonly used to refer to Social Security, a government program that provides retirement benefits and disability insurance.
2. It could also stand for Secret Service, which is an agency of the United States Department of Homeland Security tasked with protecting the President, Vice President, and other high-ranking officials.
3. In some countries, SS may refer to a specific type of vehicle registration plate or license plate number (e.g., "AB12 SS").
4. It could also be an abbreviation for Secondary School, which is the name given to high schools in many countries around the world.