# HP-21S

> Programmable calculator

**Wikidata**: [Q9284772](https://www.wikidata.org/wiki/Q9284772)  
**Source**: https://4ort.xyz/entity/hp-21s

## Summary
The HP-21S is a programmable calculator manufactured by Hewlett-Packard, following the HP-20S model. It is classified as a calculator and was part of Hewlett-Packard's lineup of computing devices.

## Key Facts
- **Instance of**: Calculator
- **Manufacturer**: Hewlett-Packard (American information technology company founded in 1939)
- **Predecessor**: HP-20S (another programmable calculator)
- **Sitelink count**: 1 (indicating limited online references)
- **Commons category**: HP-21S (for related media)
- **Wikidata description**: Programmable calculator
- **Google Knowledge Graph ID**: /g/121xkhrt

## FAQs
### Q: What is the HP-21S?
A: The HP-21S is a programmable calculator produced by Hewlett-Packard. It is classified as a calculator and follows the HP-20S model.

### Q: Who manufactured the HP-21S?
A: The HP-21S was manufactured by Hewlett-Packard, an American information technology company founded in 1939.

### Q: What is the relationship between the HP-21S and the HP-20S?
A: The HP-21S succeeded the HP-20S, another programmable calculator, indicating a progression in Hewlett-Packard's calculator lineup.

### Q: How is the HP-21S categorized?
A: The HP-21S is classified as a programmable calculator, aligning with its predecessor, the HP-20S.

### Q: Where can I find more information about the HP-21S?
A: Limited online references exist for the HP-21S, with a sitelink count of 1. For further details, check the HP-21S commons category or related Wikipedia pages.

## Why It Matters
The HP-21S represents an evolution in programmable calculators from Hewlett-Packard, building on the foundation of its predecessor, the HP-20S. As part of Hewlett-Packard's broader lineup of computing devices, the HP-21S contributed to the company's legacy in the calculator market. While its online presence is limited, it remains a notable entry in the history of programmable calculators, reflecting Hewlett-Packard's advancements in the field.

## Notable For
- **Programmability**: Like its predecessor, the HP-21S was a programmable calculator, allowing users to store and execute custom sequences of operations.
- **Manufacturer**: Hewlett-Packard, a pioneering American technology company, produced the HP-21S.
- **Limited Online Presence**: The HP-21S has a low sitelink count (1), indicating its relative obscurity compared to other calculators of its era.
- **Commons Category**: The HP-21S is associated with a commons category, suggesting potential media or documentation available for further study.
- **Google Knowledge Graph ID**: The HP-21S is recognized in Google's Knowledge Graph, indicating its inclusion in structured data systems.

## Body
### Overview
The HP-21S is a programmable calculator manufactured by Hewlett-Packard. It follows the HP-20S, another programmable calculator, and is classified as a calculator. The HP-21S is part of Hewlett-Packard's broader lineup of computing devices, which includes hardware and software solutions.

### Manufacturer
Hewlett-Packard, founded in 1939, is an American information technology company. The company has a long history in the computer hardware and software industries, with headquarters in Palo Alto, California. As of 2014, Hewlett-Packard employed approximately 302,000 people, and by 2016, this number had decreased to around 48,000.

### Relationship to HP-20S
The HP-21S succeeded the HP-20S, another programmable calculator. Both models were part of Hewlett-Packard's calculator lineup, reflecting the company's advancements in programmable computing devices.

### Online Presence
The HP-21S has a limited online presence, with a sitelink count of 1. This suggests that while the calculator is recognized, it is not widely referenced or discussed online. For further information, the HP-21S commons category may provide additional resources.

### Wikidata and Google Recognition
The HP-21S is included in Wikidata and Google's Knowledge Graph, indicating its inclusion in structured data systems. Its Wikidata description simply states that it is a programmable calculator, aligning with its classification.