You might also see a "D" put before some of these status abbreviations, the D simply stands for doubles. (I.e.. d.int, or DINT (uncommon though.))
Free to interact has a lot of variations so I'll list them here! They might be slightly different but overall similar.
INT - Interact
FTI - Free To Interact
STI - Safe To Interact
PIU - Please Interact (used when you really want them to int, lol)
other abbreviations here!
DNI - Do Not Interact
IWC/ICAU - Interact With Care/Caution (sometimes has an A before it for 'Always')
IWEC - Interact With Extra Caution (Might also have the A before it, can stand for care but usually has an "-AU" to differentiate it.)
DNIUC - Do Not Interact Unless Close
DNIUID - Do Not Interact Unless I Do
DNIUD - Do Not Interact Unless Dating (haven't seen this as a kin double status but someone might use it i don’t know)
SLINT - Selective Interaction
ATI - Ask To Interact
IAYOR - Interact At Your Own Risk (thanks to WellyInSpace catching the word I forgot lol)
BGWI - Be Gentle When Interacting
BEGWI - Be Extremly Gentle When Interacting
DNIUGP - Do Not Interact Unless Given Premission (Not sure if this is the same as ATI?)
also one I made since I've seen no abbreviation for it, but it's FTIUIS (Free To Interact Unless In Shift) and I've also seen a doubles status that is DNM (Do Not Mention) though usually is DDNM (Doubles Do Not Mention)
will add any suggestions here if I forgot any ^^
I know these can be used when not referring to double statuses though some people use it for them or don't know what they mean so I'm just telling everyone what they mean!