What is the definition of gh7 in neighborhood patterns?

In the neighborhood patterns, the variable work_behavior_device_home_areas is defined as excluding devices whose visit is in the same gh7 as their home location. What is the definition of gh7? Thank you!

GeoHash7 = within ~150m cell of device nighttime location

https://www.movable-type.co.uk/scripts/geohash.html

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