Batch of more or less technical unrecognized acronyms

- ROM: https://en.wikipedia.org/wiki/Read-only_memory
- LOC, SLOC: https://en.wikipedia.org/wiki/Source_lines_of_code
- LSb, MSb: https://en.wikipedia.org/wiki/Bit_numbering
- FFT: https://en.wikipedia.org/wiki/Fast_Fourier_transform
- LUT: https://en.wikipedia.org/wiki/Lookup_table
- DCT: https://en.wikipedia.org/wiki/Discrete_cosine_transform
- AVC: https://en.wikipedia.org/wiki/Advanced_Video_Coding
- AAC: https://en.wikipedia.org/wiki/Advanced_Audio_Coding
- MP4: https://en.wikipedia.org/wiki/MP4_file_format
- TL;DR: https://en.wikipedia.org/wiki/TL;DR
- LGPL: https://en.wikipedia.org/wiki/GNU_Lesser_General_Public_License
- CMYK: https://en.wikipedia.org/wiki/CMYK_color_model
- ASM: https://en.wikipedia.org/wiki/Assembly_language
- EPUB: https://en.wikipedia.org/wiki/EPUB
- NTP: https://en.wikipedia.org/wiki/Network_Time_Protocol
- POSIX: https://en.wikipedia.org/wiki/POSIX
- sRGB: https://en.wikipedia.org/wiki/SRGB
- MSE: https://en.wikipedia.org/wiki/Mean_squared_error
- PCA: https://en.wikipedia.org/wiki/Principal_component_analysis

Should I report those? I feel like it's a never ending list. A more exhaustive list might be found somewhere?

What about abbreviation, like "Sci-fi"?

Start by reviewing how Harper currently handles unrecognized acronyms and abbreviations; the issue names no files, tests, or entry points. Use the listed acronyms as examples, then clarify the intended scope and what completion should mean before starting implementation.

Written by the indexing model from the issue text.