> For the complete documentation index, see [llms.txt](https://docs.occuspace.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.occuspace.io/glossary.md).
# Glossary
### Sensor
Occuspace sensors collect signal activity data. Every sensor has an associated ID on the back, which you will use during installation.
### Sensor Placement
A sensor placement refers to where a sensor is placed within a zone. This is mapped to a physical location, usually denoted by a label like "1A" on marked-up floorplans.
### Zones
A zone refers to the physical spaces where we return data for. In the picture below, there are two zones -- West Area & East Area.
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