Polish-Serbian dictionary   Subject Number of entries Economics 8.879 Mathematics 3.285 Microsoft 2.170 Electric motors 1.271 Electronics 1.145 Electricity generation 1.075 Thermal Energy 974 Vacuum tubes 911 Electrical engineering 518 Magnetics 385 Fish farming pisciculture 378 Power system protection 352 Power electronics 351 Cables and cable production 345 Computer networks 343 Electric machinery 335 Power lines 333 Accumulators 324 Transformers 307 Ichthyology 297 Metrology 189 Isolation 187 Patents 152 Lighting other than cinema 124 Ecology 95 Risk Management 85 Printed circuit boards 75 Ornithology 60 Mammals 55 Ultrasound 45 Statistics 42 Radio 2 Geriatrics 1.347 Legislative acts 1.348 Nigeria 1.349 Total: 29.133