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IR blaster.
Ad-Hoc wireless networking. I miss it, was useful back in the day if you needed to share files with multiple people without a wireless router at a location. Most laptops don't support this anymore. To be fair, I've only really wanted to use it maybe twice in the last 10 years.
WiFi Direct has taken the place of that but very very few apps use it and there's compatibility issues
Wifi direct only works between two devices. Sad.
The API supports more than 2 simultaneous connections, but the built in sharing tool in Android probably doesn't