* A misspelling: Perhaps you meant a different word, like "GRIM" or "REMINDER".
* A personal name: "Grimner" could be someone's name, especially in a Scandinavian context (it is a Norse mythological figure).
* A specific term: It might be an abbreviation or acronym used within a particular field or context.
To understand the meaning of "Grimner", please provide more context.
For example, could you tell me:
* Where did you encounter this term? (e.g., in a book, a website, a conversation)
* What was the topic or subject being discussed?
* Are there any other letters or symbols around it?
With more information, I can help you decipher its meaning.