What's the plural form of run-length encoding? Here's the word you're looking for.
Answer
The noun run-length encoding can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be run-length encoding.
However, in more specific contexts, the plural form can also be run-length encodings e.g. in reference to various types of run-length encodings
or a collection of run-length encodings.