Pyrotechnics is a field of study often thought synonymous with the manufacture of fireworks, but more accurately has a wider scope that includes items for military and industrial uses.
Pyrotechnics is usually abbreviated to "pyro". It involves the use of explosions, flashes, smoke, etc. on-stage.
Note: pyrotechnics need extemely careful handling and pyropots etc. should always be disconnected from the power supply when they are being loaded. There are strict legal and Health and Safety rules about the handly and storage of pyro.