gesture, action, or sound that is used to convey information or instructions. Acts or sounds that tells someone to do or start. To be evidence/an indication something will happen.

person or thing that directs or regulates something. People responsible for managing /making decisions.

brought together so that link is established. To become friends with another person.

branch of physics and technology concerned with design of circuits using transistors and microchips. Science of electrons and their action.

Being the accepted normal level of quality. level of quality or attainment.

To represent something using a symbol or sign.

action of providing or being provided with amusement or enjoyment.

study of people's efficiency in their working environment. Study of the ease of use of equipment.

made of plastic. synthetic material made from organic polymers.

Expressed using writing. To invent or create a computer program. To create a song or piece of music.

nickname for liveried pageboy, now normally only in pantomimes. Switches activated by pressing. To fasten e.g. a shirt, coat.

control column of aircraft.

analogous or equivalent. To write letters or emails to someone.

To exchange goods without spending money; trade.

Idea or memory. To have an idea, opinion or belief about something.