Accounting	69
Accumulators	9
Acridology	15
Agriculture	2780
American usage, not spelling	49
Amphibians and reptiles	18
Analytical chemistry	40
Animal husbandry	111
Antennas and waveguides	71
Architecture	4
Art	24
Astronautics	14
Astronomy	94
Athletics	29
Automated equipment	276
Automatic control	27
Automobiles	2
Aviation	927
Avuncular	28
Banking	132
Basketball	21
Biochemistry	1
Bioenergy	7
Biology	18
Biotechnology	40
Book binding	32
Botany	65
Boxing	23
Brewery	1
British usage, not spelling	50
Building materials	8
Building structures	23
Business	78
Cables and cable production	17
Cartography	2
Chemical fibers	11
Chemistry	1091
Chess	4
Cinematography	11
Climatology	5
Coal	284
Commerce	260
Communications	1873
Computer games	1
Computer networks	7
Computer numerical control	27
Computers	577
Construction	2808
Cooking	1
Corporate governance	85
Criminal law	93
Cultural studies	194
Customs	26
Cycle sport	13
Cycling other than sport	1
Data processing	37
Demography	46
Dosimetry	52
Dyalysis	18
Dyes	4
Earth sciences	633
Ecology	11
Economics	1165
Education	396
Electric machinery	9
Electric motors	11
Electric traction	27
Electrical engineering	9
Electricity	3
Electricity generation	15
Electrochemistry	4
Electronics	1763
Employment	11
Energy industry	197
Engineering	2
English	2
Entomology	5
Environment	1079
Equestrian sports	28
European Union	25
Fencing	11
Figurative	43
Finances	2562
Fish farming pisciculture	267
Fishery fishing industry	90
Food industry	259
Food service and catering	61
Football	16
Forestry	298
Foundation engineering	2
Gardening	1
Gear train	18
General	8940
Genetics	31
Geography	43
Geology	5
Government, administration and public services	29
Grammar	2
Grass hockey	4
Gymnastics	293
Handball	15
Health care	639
High energy physics	115
Hobbies and pastimes	174
Horticulture	29
Human resources	85
Human rights activism	112
Humorous / Jocular	12
Hydraulic engineering	5
Hydrology	33
Ice hockey	5
Ichthyology	34
Immigration and citizenship	193
Industry	1376
Informal	157
Information technology	1673
Insurance	262
International law	13
International Monetary Fund	510
International trade	142
Investment	5
Ironical	5
Isolation	13
Judo	52
Kayaking	4
Knitted goods	5
Labor law	348
Labor organization	23
Laboratory equipment	31
Latin American	2
Law	3236
Leather	14
Librarianship	38
Life sciences	609
Lighting other than cinema	8
Linguistics	24
Literature	6
Loading equipment	8
Machinery and mechanisms	1
Magnetics	11
Mammals	3
Marketing	365
Materials science	411
Mathematics	97
Measuring instruments	63
Mechanic engineering	832
Mechanics	6
Medical	1471
Medical appliances	452
Metallurgy	1838
Microbiology	12
Microsoft	556
Military	47
Milk production	53
Mineral products	45
Mineralogy	1
Mining	20
Municipal planning	107
Name of organization	1081
Natural resourses and wildlife conservation	630
Natural sciences	475
Nautical	5
Navy	1
Nuclear and fusion power	18
Nuclear physics	346
Obsolete / dated	18
Oil / petroleum	18
Ornithology	40
Packaging	339
Paint, varnish and lacquer	1
Paragliding	27
Patents	690
Pejorative	1
Pest control	44
Pharmacology	1
Pharmacy and pharmacology	71
Philately / stamp collecting	1
Phonology	10
Photography	4
Physical sciences	26
Physics	8
Piezoelectric crystals	18
Planning	3
Plastics	7
Platform diving	6
Politics	428
Polygraphy	4
Polymers	6
Power electronics	13
Power lines	28
Power system protection	5
Pragmatics	1
Private international law	2
Procedural law	56
Proper and figurative	6
Proverb	8
Pulp and paper industry	6
Radiation	303
Radio	38
Radiography	25
Radiolocation	1
Radiology	1
Rail transport	18
Reliability	13
Religion	30
Remote sensing	32
Research and development	68
Resins	2
Road works	9
Rowing	43
Rude	2
Sailing	13
Satellite communications	1
School	14
Scientific	41
Security systems	27
Semiconductors	10
Shooting sport	6
Skiing	29
Slang	2
Social science	380
Socialism	22
Sociolinguistics	2
Sociology	11
Soil science	38
Sound recording	10
Speed skating	26
Sports	43
Statistics	458
Stock Exchange	1
Sugar production	1
Superconductivity	22
Survey	1
Swimming	26
Table tennis	1
Taxes	154
Technology	1212
Telecommunications	200
Telegraphy	14
Telephony	2
Television	3
Tennis	14
Textile industry	297
Thermal Energy	18
Thermal engineering	1
Tobacco industry	1
Tools	1
Trade unions	10
Transformers	5
Transport	3662
Travel	5
United Nations	904
Vacuum tubes	6
Veterinary medicine	12
Video recording	2
Virology	18
Volleyball	8
Waste management	9
Water polo	3
Water resources	170
Water supply	5
Weightlifting	5
Welding	6
Welfare & Social Security	34
Wind Energy	2
Wood processing	69
Work flow	105
Wrestling	65
Zoology	7


Triangle abbr.
astr.	Triangulum
triangle abbr.
chem.	pipe-clay triangle
fish.farm.	dan leno triangle
med.	triangle; trigone
transp.	wishbone