No, oven timers are not banshees trapped in your oven. The concept of oven timers is entirely mechanical and electronic, depending on the type of oven.
Older ovens might have mechanical timers that use gears, springs, and a simple clockwork mechanism to count down the time and trigger a bell or buzzer when the set time is up. Newer ovens typically have digital timers that use electronic circuits to keep track of the time and sound an alarm when the countdown ends.
Banshees, on the other hand, are mythical creatures from Irish and Scottish folklore, often associated with wailing or shrieking. They are not real entities but rather supernatural beings believed to be harbingers of death or misfortune.
So, to clarify, oven timers have nothing to do with banshees or any other supernatural creatures. They are just practical devices designed to help us cook and bake by alerting us when the set cooking time is completed.