Commonly used:
* General Knowledge Society
* General Knowledge Test
* Graduate Knowledge Society
Less common:
* General Knowledge Services
* Gdańsk Klub Sportowy (a Polish sports club)
* Global Knowledge Systems
To find the correct meaning, you'll need more context. Please provide more information about where you saw the abbreviation "GKS". For example:
* What is the topic or subject of the text?
* What are the surrounding words?
* Is there a specific organization or institution associated with this abbreviation?
