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For working models with parts that function or move, kits are usually used. Construction kits are helpful for making mechanical models showing how gears, levers, or pulley systems work. They can also be used for modelling structures. Electronic modelling can be carried out using breadboards, pinboards, or Veru board. Computer simulations are another way of modelling ideas. There are a number of specialist software programs that can be used to model ideas across a range of design and technology subjects, from stresses in materials, to computer-aided design, to electronics and mechanisms.
The prophet Muhammad is said to have used a green banner. Past variants of the flag show two crossed swords. Effective date: 15 March 1973.
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