# REX

> 21527

**Wikidata**: [Q111499776](https://www.wikidata.org/wiki/Q111499776)  
**Source**: https://4ort.xyz/entity/rex-q111499776

## Summary
REX is an artificial satellite. Its identifier in the provided data sources is 21527 and it is represented in Wolfram Language as Entity["Satellite","21527"].

## Key Facts
- REX is an instance of an artificial satellite.
- The Wikidata short description for REX is "21527".
- The Wolfram Language entity code for REX is Entity["Satellite","21527"].
- REX is categorized under the class "artificial satellite," defined as a human-made object put into an orbit.
- The related class "artificial satellite" has a sitelink count of 142 in the provided data context.
- No SEO data is available for REX in the provided context.

## FAQs
### Q: What is REX?
A: REX is an artificial satellite. In the provided records it is identified by the numeric descriptor 21527.

### Q: How is REX represented in Wolfram Language?
A: REX is represented as Entity["Satellite","21527"] in the Wolfram Language entity coding shown in the source.

### Q: What does the Wikidata description for REX say?
A: The Wikidata short description provided for REX is "21527".

### Q: Is there SEO or public descriptive metadata available for REX?
A: No SEO data is available for REX in the provided context.

## Why It Matters
REX matters as a cataloged entry within structured data sources for space objects. Being identified as an instance of the "artificial satellite" class places REX in the set of human-made objects placed into orbit, and its presence in data systems is indicated by explicit identifiers in both Wikidata and Wolfram Language. Those identifiers enable lookup, cross-referencing, and integration with other datasets that track satellites and related objects. Even when descriptive metadata is minimal—as in this case, where the Wikidata description is a numeric token and no SEO data is present—having consistent identifiers (for example, the Wolfram entity code) supports machine-readability and discovery in knowledge graphs, catalogs, and computational tools used by researchers, data curators, and applications that work with satellite records.

## Notable For
- Being explicitly classified as an instance of the "artificial satellite" class.
- Having the Wikidata short description recorded as "21527".
- Being represented in Wolfram Language as Entity["Satellite","21527"].
- Appearing in a context where the broader class "artificial satellite" is linked across 142 sitelinks.
- Lack of available SEO metadata in the provided dataset.

## Body
### Identification
- Name: REX (as given).
- Identifier/description in source data: 21527.
- Wolfram Language entity code: Entity["Satellite","21527"].
- Wikidata short description: "21527".

### Classification
- Instance of: artificial satellite.
- Class definition (from related material): an artificial satellite is a human-made object put into an orbit.

### Data source pointers
- Wikidata provides a short description value of "21527" for this entity.
- Wolfram Language represents the entity as Entity["Satellite","21527"].
- The class "artificial satellite" associated with this entity has a sitelink count of 142 in the provided context.

### Metadata availability
- No SEO data is available for REX in the provided information.

(End of entry.)