What is $ref in Capabilities Docs?

Developer Programs Writing Device Types
1

When I read Capabilities Docs. I can’t understand what $ref meaning. Any one can explain it.
Ex: ```
$ref: ActivityState or $ref: HvacMode

What is ActivityState, HvacMode ?,
[docs link](https://docs.smartthings.com/en/latest/capabilities-reference.html#air-conditioner-mode)
2

Please link to a specific page in the Docs by URL.

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