# type (category)

A kind of set of things that are not different from each other.

- Computed level: L4 (depth in the emergence graph, not abstraction)
- Status: review  ·  Domain: metaphysics  ·  Arena: concept

## Emergence
**Emerges from:** [pattern](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-pattern.regularity), [sets](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-sets.grouped), [difference](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-difference.relation)

**Through:** When a kind of set of things that are not different from each other is made, it is a type.

**Novel properties:**
- shared category
- collective label
- group identity

## Examples
- Water molecules in a snowflake exhibit hexagonal symmetry due to hydrogen bonding at 0°C and standard pressure. *(physics)*
- All cells in a human liver express the same core set of genes defining hepatocyte function. *(biology)*
- Every instance of the 'Button' component in the 2023 React library shares identical default properties and behavior. *(computing)*

## Used by
- [category](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-category.group) (L9)
- [class](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-class.category) (L5)
- [edition](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-edition.publication) (L11)
- [green](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-green.color) (L9)
- [title](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-title.label) (L14)
- [version](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-version.variant) (L5)

---
*Canonical: https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-type.category*  
*Structured data: https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-type.category.json*  
*Every definition provably resolves to space, time, energy and pattern.*