The term 'summoned on a beeper' can be represented by the crossword solution 'PAGED, ' which is a five-letter word. Paging is a communication technology that was popular in the late 20th century, before the widespread use of cell phones. It allowed people to be summoned by sending a signal to a device known as a beeper. The beeper would then emit a sound or vibration to alert the user that they had been PAGED.