gesture, action, or sound that is used to convey information or instructions. Road-side lights that direct traffic to go or stop. To make a noise or motion to tell someone to start.

person or thing that directs or regulates something. People who manages and checks a company's money.

brought together so that link is established. To associate a thing with something else.

branch of physics and technology concerned with design of circuits using transistors and microchips. Devices, systems built using electrical technology.

Being the accepted normal level of quality. Official unit of measuring something.

To show something; direct attention to; point out.

Act or process of providing service for someone.

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

Being easily formed or shaped. Stiff but usually flexible man-made material.

Expressed using writing. To invent or create a computer program. To compose letters and words on paper of a screen.

nickname for liveried pageboy, now normally only in pantomimes. Small round piece materials used to fasten clothing. To fasten e.g. a shirt, coat.

control column of aircraft.

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

take part in exchange of.

idea or opinion produced by thinking, or occurring suddenly in mind. To have an idea about something without certainty.