| Subject |
Number of entries |
| Abbreviation |
2 |
| Accounting |
1.446 |
| Accumulators |
176 |
| Acoustics |
184 |
| Acridology |
214 |
| Aerodynamics |
2 |
| Aerohydrodynamics |
30 |
| Aeronautics |
272 |
| Agriculture |
56.290 |
| Airships |
4 |
| Alcohol distilling |
21 |
| Alternative dispute resolution |
1 |
| Ammunition |
37 |
| Anatomy |
8 |
| Animal husbandry |
2.859 |
| Antennas and waveguides |
2.617 |
| Archaic |
1 |
| Architecture |
9 |
| Armored vehicles |
97 |
| Art |
471 |
| Artillery |
421 |
| Astronautics |
450 |
| Astronomy |
85 |
| Automated equipment |
3.814 |
| Automatic control |
463 |
| Automobiles |
4.213 |
| Aviation medicine |
22 |
| Aviation |
1.860 |
| Bacteriology |
51 |
| Ballistics |
37 |
| Banking |
2.917 |
| Baseball |
1.538 |
| Beekeeping |
2 |
| Beverages |
54 |
| Biochemistry |
221 |
| Bioenergy |
33 |
| Biology |
458 |
| Biotechnology |
905 |
| Book binding |
301 |
| Botany |
9.199 |
| Brewery |
36 |
| Building materials |
2 |
| Business |
548 |
| Cables and cable production |
250 |
| Cartography |
81 |
| Ceramics |
60 |
| Chemical fibers |
484 |
| Chemistry |
38.539 |
| Cinematography |
652 |
| Climatology |
124 |
| Coal |
5.436 |
| Coffee |
8 |
| Commerce |
2.493 |
| Communications |
35.631 |
| Computer graphics |
1 |
| Computer networks |
156 |
| Computer numerical control |
1.037 |
| Computers |
1.287 |
| Construction |
8.612 |
| Cooking |
1 |
| Corporate governance |
1.295 |
| Criminal law |
967 |
| Cryptography |
23 |
| Cultural studies |
1.785 |
| Customs |
286 |
| Data processing |
808 |
| Deafblindness |
161 |
| Demography |
949 |
| Dermatology |
3 |
| Drilling |
1.307 |
| Drives |
6 |
| Dyalysis |
752 |
| Dyes |
206 |
| Earth sciences |
17.512 |
| Ecology |
1.185 |
| Economics |
22.153 |
| Education |
5.925 |
| Electric machinery |
269 |
| Electric motors |
487 |
| Electric traction |
690 |
| Electrical engineering |
42 |
| Electricity generation |
342 |
| Electricity |
535 |
| Electrochemistry |
166 |
| Electronics |
39.061 |
| Embryology |
22 |
| Employment |
88 |
| Energy industry |
2.925 |
| Engines |
82 |
| English |
202 |
| Entomology |
3.735 |
| Environment |
23.592 |
| Ethnology |
1 |
| Ethology |
1 |
| European Union |
38 |
| Explosives and Explosive Ordnance Disposal |
61 |
| Fat-and-oil industry |
21 |
| Finances |
33.442 |
| Fish farming pisciculture |
6.954 |
| Fishery fishing industry |
1.660 |
| Food industry |
7.110 |
| Food service and catering |
1.598 |
| Footwear |
582 |
| Forensics |
1 |
| Forestry |
5.937 |
| Fortification |
10 |
| Gardening |
88 |
| General |
88.664 |
| Genetics |
2.090 |
| Geochemistry |
1 |
| Geography |
1.056 |
| Geology |
335 |
| Geometry |
18 |
| Geophysics |
15 |
| Glass production |
24 |
| Government, administration and public services |
574 |
| Ground forces Army |
5 |
| Gynecology |
2 |
| Health care |
28.781 |
| Heating |
1 |
| Helicopters |
71 |
| Hobbies and pastimes |
2.038 |
| Horticulture |
1.034 |
| Human rights activism |
1.371 |
| Hydraulics |
11 |
| Hydrology |
608 |
| Hygiene |
44 |
| Ichthyology |
2.066 |
| Idiomatic |
2 |
| Immigration and citizenship |
1.728 |
| Industry |
27.054 |
| Informal |
13 |
| Information technology |
29.622 |
| Insurance |
2.816 |
| International law |
146 |
| International Monetary Fund |
15.084 |
| International trade |
547 |
| Internet |
824 |
| Investment |
61 |
| Isolation |
342 |
| Jargon |
8 |
| Jet engines |
14 |
| Knitted goods |
314 |
| Labor law |
3.318 |
| Labor organization |
268 |
| Laboratory equipment |
382 |
| Lasers |
402 |
| Latin American |
39 |
| Law |
25.038 |
| Leather |
424 |
| Librarianship |
877 |
| Life sciences |
15.844 |
| Lighting other than cinema |
484 |
| Literature |
2 |
| Loading equipment |
1.590 |
| Logistics |
38 |
| Machine tools |
72 |
| Magnetics |
507 |
| Mammals |
190 |
| Marketing |
3.713 |
| Materials science |
5.789 |
| Mathematics |
7.694 |
| Measuring instruments |
4.726 |
| Mechanic engineering |
21.707 |
| Mechanics |
342 |
| Medical appliances |
30 |
| Medical |
115.337 |
| Metallurgy |
12.014 |
| Meteorology |
10.671 |
| Mexican |
610 |
| Microbiology |
250 |
| Microelectronics |
7 |
| Microscopy |
68 |
| Microsoft |
19.163 |
| Military |
1.264 |
| Milk production |
570 |
| Mineral products |
281 |
| Mineralogy |
301 |
| Mining |
107 |
| Municipal planning |
1.356 |
| Music |
5 |
| Name of organization |
7.594 |
| Natural resourses and wildlife conservation |
5.451 |
| Natural sciences |
19.086 |
| Nautical |
918 |
| Navigation |
114 |
| Navy |
42 |
| Nuclear and fusion power |
302 |
| Nuclear physics |
1.456 |
| Obsolete / dated |
913 |
| Obstetrics |
9 |
| Occupational health & safety |
2 |
| Oceanography & oceanology |
77 |
| Oil / petroleum |
457 |
| Oil and gas technology |
2 |
| Oil and gas |
2 |
| Ophthalmology |
138 |
| Optics branch of physics |
26 |
| Ornithology |
60 |
| Packaging |
10.309 |
| Paint, varnish and lacquer |
53 |
| Patents |
12.992 |
| Pathology |
3 |
| Pedagogics |
2 |
| Pest control |
2.272 |
| Pets |
27 |
| Phaleristics |
10 |
| Pharmacology |
98 |
| Pharmacy and pharmacology |
3.839 |
| Philately / stamp collecting |
5 |
| Photography |
185 |
| Physical sciences |
1.426 |
| Physics |
422 |
| Physiology |
2 |
| Piezoelectric crystals |
274 |
| Pipelines |
6 |
| Planning |
45 |
| Plastics |
142 |
| Plumbing |
26 |
| Pneumatics |
7 |
| Police |
485 |
| Politics |
11.565 |
| Polygraphy |
216 |
| Polymers |
134 |
| Postal service |
1 |
| Power electronics |
183 |
| Power lines |
674 |
| Power system protection |
392 |
| Printed circuit boards |
31 |
| Private international law |
37 |
| Procedural law |
886 |
| Procurement |
89 |
| Production |
7 |
| Programming |
10 |
| Project management |
97 |
| Proverb |
2 |
| Psychiatry |
28 |
| Psychology |
989 |
| Public relations |
11 |
| Pulp and paper industry |
264 |
| Radio |
1.571 |
| Radiolocation |
120 |
| Radiology |
238 |
| Rail transport |
570 |
| Real estate |
919 |
| Reliability |
353 |
| Religion |
319 |
| Remote sensing |
1.078 |
| Research and development |
459 |
| Resins |
79 |
| Risk Management |
50 |
| Road works |
2 |
| Satellite communications |
116 |
| School |
40 |
| Scientific |
906 |
| Scuba diving |
119 |
| Securities |
1 |
| Security systems |
288 |
| Semiconductors |
117 |
| Shipbuilding |
10 |
| Skydiving |
28 |
| Social science |
6.063 |
| Socialism |
50 |
| Sociology |
419 |
| Soil science |
2.136 |
| Sound recording |
327 |
| Spanish |
549 |
| Spices |
72 |
| Sports |
27 |
| Statistics |
10.914 |
| Stonemasonry |
15 |
| Sugar production |
159 |
| Superconductivity |
393 |
| Surgery |
3 |
| Surname |
23 |
| Surveying |
19 |
| Taxes |
1.727 |
| Technology |
47.080 |
| Telecommunications |
696 |
| Telegraphy |
615 |
| Telephony |
306 |
| Television |
77 |
| Teratology |
1 |
| Textile industry |
8.496 |
| Thermal Energy |
464 |
| Thermal engineering |
18 |
| Tinware |
3 |
| Tobacco industry |
25 |
| Tools |
19 |
| Topography |
45 |
| Toponym |
30 |
| Toxicology |
33 |
| Trade unions |
467 |
| Transformers |
140 |
| Transport |
48.506 |
| Travel |
1 |
| Turbines |
8 |
| Typography |
6 |
| Ultrasound |
33 |
| Uncommon / rare |
1 |
| United Nations |
11.392 |
| United States |
27 |
| Vacuum tubes |
66 |
| Ventilation |
6 |
| Veterinary medicine |
2.155 |
| Video recording |
133 |
| Virology |
28 |
| Waste management |
187 |
| Water resources |
2.144 |
| Water supply |
110 |
| Weapons and gunsmithing |
348 |
| Weapons of mass destruction |
3 |
| Welding |
122 |
| Welfare & Social Security |
53 |
| Wind Energy |
74 |
| Winemaking |
3 |
| Wood processing |
1.230 |
| Work flow |
2.882 |
| Zoology |
95 |
| Total: |
1.078.454 |
