What are these icons for a device value?

What does the little house icon mean for some devices when setting up a piston? This screenshot is from ecobee Suite Manager

TIA,
Eric

Screenshot 2025-03-10 110804

Only non-standard device attributes, i.e. not part of the built-in capability, get that symbol. For example picking this for the variable in webcore
image
defines it as


refering to this custom attribute on the device
image
which at runtime evaluates to