# Period Tag

> A formal definition of the tag for a file that defines a named span of calendar time such as a billing month, filed in a periods folder.

Record: `lexicon:period-tag`
Kind: artifact
Layer: [Structural Core](https://banes-lab.com/records/layer/structural-core.md)
Canonical: https://banes-lab.com/ontology/lexicon#lexicon-period-tag

Listed in [Lexicon terms](https://banes-lab.com/api/records/lexicon.md), after [Delay Tag](https://banes-lab.com/records/lexicon/delay-tag.md) and before [Window Tag](https://banes-lab.com/records/lexicon/window-tag.md).

## Category

- [Runtime Concerns](https://banes-lab.com/records/lexicon-category/runtime-concerns.md)