Here is a list of some common terms and acronyms used in the diving industry:

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SCUBA: Self-Contained Underwater Breathing Apparatus

BCD: Buoyancy Control Device

NDL: No Decompression Limit

RNT: Residual Nitrogen Time

RDP: Recreational Dive Planner

SAC: Surface Air Consumption

TBT: Total Bottom Time

TTS: Time To Surface

PADI: Professional Association of Diving Instructors

NAUI: National Association of Underwater Instructors

SSI: Scuba Schools International

DAN: Divers Alert Network

O2: Oxygen

PO2: Partial Pressure of Oxygen

MOD: Maximum Operating Depth

EAD: Equivalent Air Depth

EANx: Enriched Air Nitrox (a type of diving gas)

DEP: Dive Emergency Plan

DCS: Decompression Sickness

CCR: Closed Circuit Rebreather

MSD: Maximum Surface Decompression

PSI: Pounds per square inch

HPNS: High-Pressure Nervous Syndrome

ADAS: Australian Diver Accreditation Scheme

BHA: Breathing Hose Assembly

COW: Configuration of the Water

DPV: Dive Propulsion Vehicle

DSAT: Diving Science and Technology Corporation

DCIEM: Defense and Civil Institute of Environmental Medicine

FIO2: Fraction of Inspired Oxygen

FO2: Fraction of Oxygen

GUE: Global Underwater Explorers

HSE: Health and Safety Executive

IANTD: International Association of Nitrox and Technical Divers

IDC: Instructor Development Course

IHMP: Incident Management and Medical Procedures

JDC: Junior Dive Control

JHA: Job Hazard Analysis

JSA: Job Safety Analysis

MSD: Maximum Surface Decompression

OOA: Out Of Air

PSCR: Primary Surface Control Regulator

SAC: Surface Air Consumption

SDC: Surface Decompression

SMB: Surface Marker Buoy

SPG: Submersible Pressure Guage

UDM: Underwater Demolition

UDT: Underwater Demolition Team

WOB: Water Oxygen Blender

WOBT: Water Oxygen Bottom Time

YOY: Year of the Year

VGE: Venous Gas Embolism

VPM-B: Varying Permeability Model-B

Again, this is not an exhaustive list and there are many more terms and acronyms used in diving. Some of them can be specific to certain agencies, countries, or regions.