LGTM  —  looks good to me

ACK  —  acknowledgement, i.e. agreed/accepted change

NACK/NAK — negative acknowledgement, i.e. disagree with change and/or concept

RFC  —  request for comments, i.e. I think this is a good idea, lets discuss

WIP  —  work in progress, do not merge yet

AFAIK/AFAICT  —  as far as I know / can tell

IIRC  —  if I recall correctly

IANAL  — “ I am not a lawyer ”, but I smell licensing issues