What is the definition of Placement Sounds?

Placement sounds are those peculiar, sometimes eerie noises that can pop up in your ears when you're trying to focus or sleep - like the ghostly hum of a refrigerator in your room, or the unmistakable 'boing' of a door closing on a vintage record player. They're the unsung heroes of sound design, adding an extra layer of ambiance to your living room, but also the perfect backdrop for a creepy horror movie sound effect.

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Here's an unsettling example sentence: "As the killer's chilling placement sounds echoed through the abandoned house, I couldn't shake the feeling that my life was about to get a whole lot more spine-tingling."