# index (reference)

a name that points to a part in a list

- Computed level: L12 (depth in the emergence graph, not abstraction)
- Status: review  ·  Domain: index  ·  Arena: EmergenceLexicon

## Emergence
**Emerges from:** [name](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-name.identifier), [list](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-list.ordered), [points](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-points.location), [part](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-part.relation)

**Through:** The name points to a part in the list and establishes a link.

**Novel properties:**
- referential access
- structured addressing
- persistent linkage

## Examples
- In Python, the variable 'i' in 'for i in range(10)' refers to each integer from 0 to 9 during iteration. *(computing)*
- The Dewey Decimal number 598.094 on a library book spine points to its position in the bird literature section. *(institutions)*
- In the Apollo 11 checklist, 'PGNCS AUTO' is step 37 in the descent sequence to the Moon. *(engineering)*

## Used by
- [reference](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-reference.citation) (L13)

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