General Prefixes:
* epi-: meaning "upon" or "on" (like "epigraph" - an inscription on a monument)
* typo-: meaning "type" or "imprint" (like "typography" - the art of printing with type)
* gram-: meaning "writing" or "letter" (like "grammar" - the rules of writing)
* script-: meaning "written" or "writing" (like "script" - a written text)
Specific Prefixes for Letters:
* alpha-: referring to the first letter of the alphabet (like "alphabetical" - arranged in order of the alphabet)
* beta-: referring to the second letter of the alphabet (like "beta testing" - a preliminary test of software or hardware)
* omega-: referring to the last letter of the alphabet (like "omega" - the last or final part of something)
Remember: These prefixes are not always used in the context of letters as written communication. They can have broader meanings related to their origin in Greek words.
If you can provide more context about what kind of "letter" you're looking for a prefix for, I might be able to give you a more specific answer. For example, are you looking for a prefix for:
* A letter of the alphabet?
* A written message?
* A letter as a symbol?