# end card

> punch card indicating end of job

**Wikidata**: [Q106184809](https://www.wikidata.org/wiki/Q106184809)  
**Source**: https://4ort.xyz/entity/end-card

## Summary
An end card is a type of punched card used to signal the end of a job or program in early computing and data processing systems. It serves as a physical marker read by machines to halt operations or move to the next task. This card is part of the broader class of punched cards, which were foundational in early data storage and computation.

## Key Facts
- An end card is a subclass of punched card.
- Its primary function is to indicate the end of a job in computing or data processing workflows.
- Punched cards, including end cards, were widely used in the mid-20th century for data input and programming.
- End cards are physically identical to other punched cards but are distinguished by their specific use or hole pattern.
- The technology was integral to early computers like IBM's systems in the 1940s–1970s.
- No unique creator or invention date is attributed specifically to the end card; it evolved with punched card systems.
- Aliases for end card include "end."

## FAQs
### Q: What is an end card used for?
A: An end card is used to signal the end of a job or sequence in computing and data processing tasks using punched cards. Machines interpret this card to stop executing the current set of instructions or data entries.

### Q: How is an end card different from other punched cards?
A: While physically similar, an end card has a designated purpose: marking the termination point of a program or dataset. Other punched cards may carry data or instructions rather than control signals.

### Q: When were end cards commonly used?
A: End cards were widely used during the era of punched card computing, roughly from the 1940s through the 1970s, especially in business and scientific computing environments.

## Why It Matters
The end card played a crucial role in early automated data processing systems. In an era before digital storage and sophisticated operating systems, physical markers like the end card allowed machines to distinguish between active data and program boundaries. This simple but essential tool enabled reliable batch processing, ensuring that jobs terminated correctly without overreading into subsequent datasets. As part of the larger punched card ecosystem, the end card contributed to the standardization and efficiency of computational workflows, laying groundwork for modern concepts like EOF (End of File) markers in software systems today.

## Notable For
- Being a functional subset of punched cards with a dedicated control purpose.
- Acting as a physical analog to modern EOF (End of File) indicators in computing.
- Supporting reliable automation in early computer programming and data handling.
- Facilitating batch processing in legacy computing environments such as those using IBM equipment.

## Body
### Definition and Role
An end card is a punched card that indicates the conclusion of a job or program in computing systems that rely on punched card input. It functions as a control card, signaling to the machine that no further actionable data follows.

### Technical Context
- **Medium**: Paper-based punched card
- **Classification**: Subclass of punched card
- **Aliases**: "end"
- **Usage Context**: Early digital computing, business data processing, scientific calculations

### Historical Usage
End cards were used extensively in systems where programs and data were fed into computers via stacks of punched cards. These systems required explicit markers to separate one job from another or to terminate execution cleanly.

### Relationship to Broader Systems
As part of the punched card family, end cards inherited standardized dimensions (typically 7.375 in × 3.25 in) and hole patterns governed by industry conventions. They were processed alongside data cards by unit record equipment and early mainframes.

### Legacy Influence
Though obsolete in modern computing, the conceptual role of the end card persists in digital formats as EOF characters or markers, preserving its fundamental utility in structuring sequential data streams.