i don't know of a sight, but I can define a few:
IWB: inside waistband carry
OWB: Outside waistband carry
CCW: concealed carry weapon (refers to the gun itself)
CCP: Concealed carry permit (Varies from state to state) Called CPL, or Concealed pistol license here in WA state.
Rig: term used for your carry method.
Cant: a term referring to the angle at which a holster keeps the weapon.
Quick primer on Cant
FMJ: full metal jacket ammunition
HP: Hollow point ammunition
FTF: failure to feed. Gun fails to cycle a round into the chamber from the magazine (semi automatic pistol)
FTE: failure to extract a spent casing from the gun correctly.
FTF and FTE lead to the gun jamming most of the time.
These are a few I can think of off the top of my head. Let me know if you are thinking about any others.