Small electronic devices that received and displayed messages before cell phones became common, especially popular in the 1990s.
From 'page' (to call someone's attention) plus the agent suffix '-er'. Originally meant someone who calls out pages, later applied to the electronic device that performs this function.
Pagers were actually still used in hospitals and emergency services into the 2020s because their simple, reliable signals worked where cell networks failed—technology doesn't always replace older systems!
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