Here are some trigger warning abbreviations that you will see around the forum and that you should use if your post needs it :

TW- Trigger warning (some say MT for might trigger, but that is not standard)
SA- Sexual abuse
RA/SRA- Ritual abuse/*****ic ritual abuse
SI/SH- Self injury/Self harm
DV/DA- Domestic violence/Domestic abuse
PA- Physical abuse
SSA- Same sex attraction
ED- Eating disorder
EA- Emotional abuse
VA- Verbal abuse
DID- Dissociative Identity Disorder