Prompt is an adjective meaning "quick" or "on time", or a verb meaning "to lead someone".

• Command prompt, in computing, one or more characters in a command line interface to indicate that the computer is ready to accept typed input
• Prompt (theatre) or "prompter", in theatre, the person who prompts an actor when they forget their next line
• Prompt corner or prompt box, the location at the side of the stage where the prompt is located
• Prompt critical, in nuclear engineering, the state of an assembly when for each nuclear fission event, one or more of the immediate or prompt neutrons released causes an additional fission event
• Prompt neutron, in nuclear engineering, a neutron immediately emitted by a nuclear fission event, as opposed to a delayed neutron
• PROMPT Telescopes, an array of telescopes located at CTIO which are designed to rapidly observe gamma-ray burst afterglows simultaneously in multiple filters

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