In no particular order as yet & list is ongoing.
SCO – Simulator Console Operator
FPV – First Person View
GPS – Global Positioning System
UAV – Unmanned Aerial Vehicle
RPAS – Remotely Piloted Air system
COA – Certicicate of Authorization
UAS – Unmanned Aircraft Systems (prefixed with s’= small) / sUAS
Drone – An unmanned vehicle. Land, Sea or Air
Multirotor – A rotocraft vehicle of any size that has multiple main rotors.
RF – Radio Frequency
RFI – Radio Frequency Interface
UGV – Unmanned Ground Vehicle
UHV – Unmanned Hybrid Vehicle
UVS – Unmanned Vehicle System
UWS – Unmanned Water-vehicle System
GCS – Ground Control Station
Line of Site – Meaning – The person controlling the aircraft must be able to see the drone.