Acronym: An abbreviation formed from the initial letters of other words and pronounced as a word. example CAD.
Abbreviation: a shortened form of a word or phrase. Example: DIA for diameter.
Using too many acronyms or abbreviations can make a drawing harder to understand. I recommend shorted words only if you can’t fit the whole word on the drawing. This stop those pesky “what does this mean?” questions from site.
Below is a handy list of what that engineering acronym or abbreviation means.
Complied by Allan Wise, based in Australia
- Created 7-July-2004
- Revised 20-Nov-2004
- Revised 20-Dec-2005
- Revised 16-August-2006
- Revised 30-April-2020
- Revised 22-May-2020
AA – Ampere
A/C – Air Conditioning
A/H – After Hours
AB – As Built
ABBR – Abbreviation
ABS – Absolute
ADD – Addendum
AEC – Architecture, Engineering, and Construction
AF – Across Flats
AFL – Above Floor Level
AFL – Above Finished Level
AG – Agricultural pipe drain
AGL – Above Ground Level
AHD – Australian Height Datum
AHU – Air Handler Unit
APPROX – Approximately or Approximate
ARRGT – Arrangement
AS – Australian Standard
ASCII – American Standard Code for Information Interchange
ASSD – Assumed Datum
ASSY – Assembly
ATF – Along Top Flange
AUTO – Automatic
AUX – Auxillary
AVG – Average
BB – Basin or Bottom
BLDG – Building
BNS – Business Network Services
BOT – Bottom
BQ – Bendable Quality
BRG – Bearing
BRS – Brass
BSP – British Standard Pipe
BT – Bath Tub
BT – Boundary Trap
BTM – Bottom
BW – Both Ways
CC – C shaped steel purlin
C/C – Cross Centres
CAD – Computer Aided Design.
Less commonly use is Computer Assisted Drafting. CAM – Computer Aided Manufacture
CAP – Capacity
CBORE – Counterbore
CCTV – Closed Circuit TeleVision
CFW – Continuous Fillet Weld
CHAM – Chamfer
CHCL – Channel
CH HD – Cheese Head
CHS – Circular Hollow Section
CI – Cast Iron
CIRC – Circumference or Circle
C.J. OR CJ – Control Joint (or Construction Joint)
CL – Center Line
CLG – Control Joint
CLR – Clearance
CMU – Cement Masonry Unit
CNC – Computer Numerical Control
CNR – Corner
CNJ – Construction Joint
COEF – Coefficient
COL – Column
COMMS – Communications
CONC – Concentric
CONN – Connection
CONT – Continuous
CP – Chrome Plated
C REC HD – Cross-Recess Head
CRS – Colled Rolled Steel
CTRS – Centres
CS – Cleaners Sink
CS – Cast Steel
CKS – Countersink
CSK HD – Countersunk Head
CT – Controller
CTR – Contour
CTR(S) – Centre/S
CTRL – Control
CTRS – Centers
CU – Dental Cuspidor
CUP HD – Cup Head
CVR – Cover
CYL – Cylinder
°C – Degrees Celsius
DDAR – Dressed All Round
DD – Design Drawing
DED – Dedendum
DET – Detail
DIA – Diameter
DIAG – Diagram
DIAG – Diagonal
DICL – Ductile Iron Cement Lined (pipe)
DIST – Distance
DIM – Dimension
DN – Diameter Nominal
DP – Down Pipe
DP – Diametral Pitch
DR – Dryer
DRG – Drawing
DW – Dishwasher
DWG – Drawing
DWG(S) – Drawing/S
EE – Modulus of Elasticity
EA – Equal Angle (steel)
EF – Each Face
E.J. or EJ – Expansion Joint
EL – Elevated Level
EL – Elevation
ELEC – Electrical
ELEV – Elevation
EQ – Equal
EQUIP – Equipment
EQUIV – Equivalent
EW – Each Way
EWB – Electric Water Boiler
EWC – Electric Water Cooler
EXT – External
FFB – Footing Beam
F’c – Characteristic Concrete Strength
FCU – Fan Coil Unit
FFL – Finished Floor Level
FHR – Fire Hose Reel
FIQ – Figure
FILL HD – Fillister Head
FL – Floor Level
FL – Flat or Flat Plate
FLG – Flange
FOC – Fibre Optic Cable
FS – Far Side
FSBL – Full Strength Butt Weld
FTG – Footing
FTP – Fibre Termination Panel (fibre optical cable)
FW – Fillet Weld
FWF – From Web Face (steel)
GGA – General Arrangement
GALV – Galvanized
GCI – Galvanized corrugated iron.
GD – Grid
GI – Galvanized Iron
GIP – Galvanized Iron Pipe
GIS – Graphic Information System
GPO – General Purpose Outlet
GR – Grade
GRF – Geometric Reference Frame
GSM – Global System of Moblie or “Groupe Speciale Mobile” in French
HH – Prewash Hose Reel
HD – Head
HEX HD – Hexagon Head
HEX SOC HD – Hexagon Socket Head
HOR – Horizontal
HORIZ – Horizontal
HP – High Pressure
HRA – Rockwell Hardness A
HRB – Rockwell Hardness B
HRC – Rockwell Hardness C
HS – High Strength
HT – Height
HTS – High-Tensile Steel
HV – Diamond Pyramid Hardness Number (Vickers)
HWB – Hair Wash Basin
II – Moment of Inertia
ID – Inside Diameter
IE – Invert Elevation
I.J. or IJ – Isolation Joint
IL – Invert Level
INT – Internal
IO – Inspection Opening
IP – Intersection Point
ISO – International Standard Organisation
JJIS – Japanese Industry Standard
JT – Joint
JUNC – Junction
KkHz – Kilohertz
K.J. or KJ – Key Joint
KS – Kitchen Sink
KWh – Kilo Watt Hour (metre)
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LL – Steel Angle
LAN – Local Area Network
LG – Length
LGX – Line Group Cross (Connector, fibre optical cable)
LH – Left Hand
LMC – Least Material Condition
LONG – Longitudinal
LPG – Liquid Petroleum Gas
LT – Laundry Trough
Mm – Metres (English) or Meters
MATL – Material
MAX – Maximum
M/C – Machine
MDF – Main Distribution Frame (Telecommunications)
MFR – Manufacturer
MHz – Megahertz
Micky Mouse – A toy project, of very low quality.
MI – Malleable Iron
MIN – Minimum
MISC – Miscellaneous
M.J. or MJ – Movement Joint
mm – Millimetres
MMC – Maximum Material Condition
MOD – Modification
MS – Mild Steel
MTG – Mounting
MUSH HD – Mushroom Head
NNC – Normally Closed
NEG – Negative
NET – Network
No. – Number
NOM – Nominal
NS – Near Side
NS – Nominal Size
N.S.O.P. – Not Shown On Plan
NTS – Not To Scale
NZS – New Zealand Standard
OOA or O/A – Overall
OCT – Octagon
OD – Outside Diameter
OPT – Optional
PP – Pipe
PA – Pressure Angle
PAR – Parallel
PATT – Pattern
PCD – Pitch Circle Diameter
PFC – Parallel Flange Channel
PL – Plate
PL – Pipeline
POS – Positive
POSN – Position
PREFAB – Prefabricated
PT – Pressure Tapping
PT – Part
PVC – Poly Vinyl Chloride
uPVC – UV Stabilized Poly Vinyl Chloride
QQTY – Quantity
RR – Radius
Ra – Roughness Value
RAD – Radius or radial
RD – Round
REF – Reference
RECT – Rectangular
REINF – Reinforcement
REQ’D or REQD – Required
REV – Revision
RH – Right Hand
RHS – Rectangular Hollow Section (rarely Rolled Holled Section)
RL – Reduced Level or Relative Level
RO – Reverse Osmosis (water treatment)
RSA – Rolled Steel Angle
RSC – Rolled Steel Channel
RSD CSK HD – Raised Countersunk Head
RSJ – Rolled Steel Joist
SS – Snug fit or tightened (bolts)
S – Sink
SAN – Sanitary
SDU – Sanitary Disposal Unit
SECT – Section
SF – Strip Footing
SF – Spot Face
SFL – Structural Finished Level
SH – Sheet
SHR – Shower
SHS – Square Hollow Section
SIM – Similar
SK – Sketch
SL – Structural Level
SPT – Spigot
SQ – Square
SS or S/S – Stainless Steel
SSL – Structural Slab Level
ST – Steel
STD – Standard
SW – Switch
TT – Top
TB – Tie Beam
TB – Fully tensioned, bearing type (bolts)
TEMP – Temperature
TF – Fully tensioned, friction type (bolts)
TFC – Taper Flange Channel
THD – Thread
THK – Thick
TO or T.O. or T.OFF – Top Off
TOL – Tolerance
TP – Tangent Point
TP – True Position
TP – True Profile
TR – Laundry Trough
TUN – Tundish
TYP – Typical
UU/S – Under Side
UA – Unequal Angle (steel)
UB – Universal Beam (steel)
UC – Universal Column (steel)
UCUT – Undercut
UNO – Unless Noted Otherwise (UON is prefered)
UON – Unless Otherwise Noted
uPVC – Unplasticized Polyvinyl Chloride
UR – Urinal
VVER – Vertical
VERT – Vertical
VOL – Volume
WWAN – Wide Area Network
WB – Welded Beam (steel)
WC – Welded Column (steel)
WC – Water Closet (toilet).
Where the poo and wee goes. WC(P) – Water Closet With ‘P’ Trap
WC(S) – Water Closet With ‘S’ Trap
WD – Working Drawing
WM – Washing Machine
WP – Water Proof or Work Point
WI – Wrought Iron XX – By. Example, “N12 x 1200 long” also means “N12 by 1200 long”.
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