* A slang term: Without context, it's hard to tell. It might be a slang expression used in a specific community or online space.
* A brand or product name: It could be the name of a brand, product, or service.
* An abbreviation: It could be an abbreviation for something, but without more context, it's impossible to guess.
* A cryptocurrency: It might be a reference to a specific cryptocurrency.
To figure out what "10K SUN" means, you'll need more context.
For example, where did you encounter this term? Was it in a conversation, online, or in a written document? Knowing the context will help you understand its meaning.