An AND gate can have two or more inputs. The output of an AND gate is true when all its inputs are true.
Aerial (Antenna) A device to receive or transmit radio signals. It is also known as an antenna.
Preset variable resistor A preset is operated with a small screwdriver or similar tool. It is designed to be set when the circuit is made and then left without further adjustment. Presets are cheaper than standard variable resistors so they are sometimes used in projects to reduce the cost.
Resistor A resistor restricts the flow of charge. Uses include limiting the current passing through an LED, and slowly charging a capacitor in a timing circuit. Some publications use the old resistor symbol