Airtags
I suspect I’m being tracked. Is it possible to locate an airtag near me?
AirTag
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From: AirTag - Apple
"AirTag is designed to discourage unwanted tracking. If someone else’s AirTag finds its way into your stuff, your iPhone will notice it’s traveling with you and send you an alert. After a while, if you still haven’t found it, the AirTag will start playing a sound to let you know it’s there.
Then there's the eponymous: