artikapro

#Natural phenomena #Machines for industry or agriculture, industrial installations, motors, engines, various mechanical appliances #Signs, notations, symbols #Quadrilaterals #Letters presenting a special form of writing #Vortices, rotary movements, tornadoes #Propellers, ventilators, blowers, turbines, burners ; all kind of propellers, including those for aircraft or ships #Pin icons #Quadrilaterals containing representations of heavenly bodies or natural phenomena #Quadrilaterals containing other figurative elements #Quadrilaterals containing one or more letters #Quadrilaterals with dark surfaces or parts of surfaces