ASL: American Sign Language
ATA: atmospheres absolute
BS: British Standard
BSI: British Standards Institute
DDA: Disability Discrimination Act
ECU: Environmental Control Unit
FPS: Foot, Pound, Second
GMDSS: Global Maritime Distress and Safety System
GPS: Global Positioning System
HID: High Intensity Discharge
HP: High Pressure
IOC: Instructor Orientation Course
IP: intermediate pressure
ISO: International Standards Organisation
LP: Low Pressure
MCA: Maritime and Coastguard Agency
MKS: metre, kilogram, second
NEC: National Exhibition Centre
P: Pressure
psi: pounds per square inch
ROV: Remotely Operated Vehicle
SCBA: Self-Contained Breathing Apparatus
SWP: Safe Working Pressure
TP: test pressure
WP: working pressure