Refrigerators, like in one's kitchen. Many “Smart Fridges” exist, but most of them don't have EOPs. Despite this, it's very easy to tell that they almost always will run Android + ARM. Older fridges have a chance of running some custom Linux OS instead of Android, but that's about it.

The LG Smart Refrigerator features two ways to gain privileges

Either soldering the eMMC flash or connecting to UART pinout allows rooting this system’s Android setup. This method requires copying over a stock Android launcher, but nonetheless, the Android install can be “unlocked” on this device.

https://www.youtube.com/watch?v=WXfQMlofuw8

https://www.exploitee.rs/index.php/LG_Smart_Refrigerator_(LFX31995ST)