• A/C – Air Conditioning
• AFL – Above Floor Level or Above Finished Level
• AGL – Above Ground Level
• BOF – Bottom of Foundation
• BHK – Bedroom, Hall, Kitchen
• BRW – Brick Retaining Wall
• BT – Bath Tub or Boundary Trap
• CAD – Computer-Aided Design
• CCTV – Closed Circuit Television
• CONT – Continuous
• DP – Downpipe
• DWG – Drawing
• ELEC – Electrical
• EWB – Electric Water Boiler
• FL – Floor Level
• FOC – Fibre Optic Cable
• FS – Far Side
• FTG – Footing
• GIS – Geographic Information System
• LAN – Local Area Network
• MISC – Miscellaneous
• NSOP – Not Shown On Plan
• NTS – Not To Scale
• REF – Reference
• REINF – Reinforcement
• REQ’D – Required
• REV – Revision
• RL – Reduced Level or Relative Level
• SAN – Sanitary
• SDU – Sanitary Disposal Unit
• RHS – Rectangular Hollow Section
• SF – Strip Footing
• SHS – Square Hollow Section
• SIM – Similar
• SL – Structural Level
• SSL – Structural Slab Level
• TB – Tie Beam
• WAN – Wide Area Network
• WC – Water Closet (toilet)
• WD – Working Drawing
• WP – Water Proof or Work Point

Engineering abbreviations cover building all different types of structures from cars to houses. Check out common engineering abbreviations you might encounter.

• AB – As Built
• AC – Alternating Current
• CHS – Circular Hollow Section
• CLG – Control Joint
• COL – Column
• COMMS – Communications
• CONN – Connection
• CT – Controller
• CTRL – Control
• CTRS – Centers
• ECN or ECR – Engineering Change Note, Engineering Change Request
• EQUIP – Equipment
• EW – Each Way
• FOS – Factor of Safety
• HP – High Pressure
• IO – Inspection Opening
• KJ – Key Joint
• L – Steel Angle
• MDF – Main Distribution Frame (Telecommunications)
• MFR – Manufacturer
• MJ – Movement Joint
• MRP – Material Requirements Planning
• NET – Network
• NO – Number
• NOM – Nominal
• NPR – New Product Release
• NC – Numerical Control
• OD – Outside Diameter
• OPT – Optional
• PCD – Pitch Circle Diameter
• PFC – Parallel Flange Channel
• PT – Pressure Tapping
• QC – Quality Control
• QTY – Quantity
• RFQ – Request for Quote
• TFC – Taper Flange Channel
• TO or T.O. or T.OFF – Top Off
• VA – Value Analysis
• UON or UNO – Unless Otherwise Noted or Unless Noted Otherwise

Looking for abbreviations for common measurements in engineering. Check out these abbreviations.

• A – Ampere
• AHU – Air Handler Unit
• APPROX – Approximately
• ASCII – American Standard Code for Information Interchange
• BTM – Bottom
• CL – Center Line
• CLR – Clearance
• CMU – Cement Masonry Unit
• CTR – Center
• DN – Diameter Nominal
• EQ – Equal
• FL – Fluid
• Foot – Foot
• HOR or HORIZ – Horizontal
• kHz – Kilohertz
• KWh – KiloWatt Hour (metre)
• LH – Left Hand
• HP – Horsepower
• M – Metres (English) or Meters
• MAX – Maximum
• MHz – Megahertz
• MIN – Minimum
• MM – Millimetres
• NS – Near Side
• R or RAD – Radius or radial
• RH – Right Hand
• SQ – Square
• TEMP – Temperature
• THK – Thick
• V – Volt
• VER or VERT – Vertical
• W – Watt
• Yd – Yard
• X – By. Example: “N12 x 1200 long” means “N12 by 1200 long”