What is the OB wire on a thermostat?

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What is the ob wire on a thermostat? Simple thermostat wiring guide (2,3,4,5,6,7,8 wires color code) Hive active heating multizone additional smart thermostat, works with

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4 wire thermostat wiring color code — onehoursmarthome.com

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Hive Active Heating Multizone Additional Smart Thermostat, Works with
Hive Active Heating Multizone Additional Smart Thermostat, Works with

Simple Thermostat Wiring Guide (2,3,4,5,6,7,8 Wires Color Code)
Simple Thermostat Wiring Guide (2,3,4,5,6,7,8 Wires Color Code)

Best Smart HVAC System Air Conditioner Fan Coil Room Wifi Tuya
Best Smart HVAC System Air Conditioner Fan Coil Room Wifi Tuya

What is the OB wire on a thermostat?
What is the OB wire on a thermostat?

4 Wire Thermostat Wiring Color Code — OneHourSmartHome.com
4 Wire Thermostat Wiring Color Code — OneHourSmartHome.com