Acronyms

[Clockstopper]

]I've been reading a few stories on this site and have come across a few acronyms that I don't understand. I'd appreciate if someone would help me with their meanings. In fact, it might be helpful to others if members would add to this short list. Thanking you in advance:

RAAC

SHHMD

HEA

 

[MNGuy]

This thread gives me deja vu.