It means that the thermocouple and the Pcb will be able to interact and function together.
This Thermocouple Connector is perfect for bridging the gap between Type-K thermocouples with standard connectors with a PCB. This little connector is actually the exact part we recommend using with our SparkFun Thermocouple Breakout! Each connector can easily attach to a printed circuit board with its included mounting clip.
If you plan on using this connector with a custom PCB make sure to check out the Datasheet in the Documents section below for mounting dimensions.