There are several shorthands and abbreviations commonly used in code reviews:

1. nit – nitpicking. Refers to minor and cosmetic changes that the reviewer suggests to the code (typos, formatting etc)
2. N/A – Not Applicable, used to indicate that a particular comment or suggestion does not apply to the code being reviewed.
3. +1 – Indicates agreement or support for a particular change or suggestion.
4. -1 – Indicates opposition or disapproval of a particular change or suggestion.
5. ACK – Acknowledge, used to indicate that the reviewer has seen the comment or suggestion and will address it.
6. WIP – Work In Progress, used to indicate that the code being reviewed is still a work in progress and may not be complete or ready for review.
7. RTFC – Read The F***ing Code, used to suggest that the reviewer should go back and read the relevant code before making a comment or suggestion.
8. FIXME – A placeholder used to indicate that a particular piece of code needs to be fixed in the future.
9. TODO – A placeholder used to indicate that a particular task needs to be completed in the future.
10. LGTM –

These shorthands and abbreviations are commonly used in code reviews to speed up the review process and make it more efficient. However, it’s important for all participants in the review to understand and agree on their meanings to avoid confusion and ensure effective communication.

If you know or use other shorthands or abbreviations, please let me know.