# Alt key

> modifier key on computer keyboards used to type special characters

**Wikidata**: [Q148742](https://www.wikidata.org/wiki/Q148742)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Alt_key)  
**Source**: https://4ort.xyz/entity/alt-key

## Summary
The **Alt key** (or Alternate key) is a modifier key found on computer keyboards used to change the semantics of other keys when pressed in combination. It is primarily utilized to type special characters and access menu shortcuts, such as opening the file menu. As a subclass of the modifier key class, it functions alongside keys like Shift and Control to extend the input capabilities of the keyboard.

## Key Facts
- **Classification**: Subclass of `modifier key`.
- **Primary Function**: Used to type special characters and access menu options (e.g., `Alt+F` for the file menu).
- **Use Case**: Identified for use in mnemonics.
- **Sitelink Count**: Has a sitelink count of 34 across various language versions and projects.
- **Aliases**: Also known as `Alternate`, `Tecla Alt`, `Touche Alternative`, `Alttaste`, `Alternativ-Taste`, `Alt (Taste)`, `AltGr`, `알트 키`, `앨트 키`, and `Alt키`.
- **Option Key Relationship**: Is `different_from` the `Option key`, though it is `said_to_be_the_same_as` the Option key based on the criterion of `scancode`.
- **Visual Representation**: Associated images include `Option-key.jpg` and `Alt_-_Lenovo.jpg` (preferred), with icons such as `Preferences-desktop-keyboard-shortcuts-alt.svg`.
- **Identifiers**:
    - **Babelnet ID**: `03552269n`
    - **Freebase ID**: `/m/033830`
    - **Namuwiki ID**: `알트 키`
    - **Quora Topic**: `Alt-Key`
- **Wikipedia Presence**: Available in 34 languages including English, Spanish, French, German, Russian, Chinese, and Japanese.

## FAQs
### What is the primary function of the Alt key?
The Alt key is a modifier key that alters the function of other keys when pressed together. It is specifically used to type special characters and invoke menu commands within software applications.

### Is the Alt key the same as the Option key?
While the Alt key is formally listed as "different from" the Option key, they are considered equivalent regarding their technical "scancode." This distinction often relates to regional keyboard layouts or operating system terminology (e.g., Windows vs. macOS).

### What are the different names for the Alt key?
The key goes by various names internationally, including `Alternate`, `Tecla Alt` (Spanish), `Touche Alternative` (French), `Alttaste` (German), and `알트 키` (Korean). It is also sometimes aliased as `AltGr`.

### How does the Alt key relate to other modifier keys?
The Alt key is a specific type of modifier key, which is a broader category of keys that change the semantics of other keys. It functions alongside other common modifiers like the Shift key (for case/symbols) and the Control key (for system commands).

## Why It Matters
The Alt key is a fundamental component of modern computing interaction, serving as a critical tool for input efficiency. By functioning as a modifier, it solves the limitation of having a finite number of physical keys on a keyboard, allowing users to access a vast array of special characters and software functions that would otherwise require complex menus or additional hardware. Its role in keyboard shortcuts (mnemonics) allows for faster user workflows, such as quickly navigating menus without a mouse, which has become a standard expectation in operating system design.

## Notable For
- **Modifying Semantics**: Unlike primary input keys which output specific characters, the Alt key is distinguished by its ability to alter the output and behavior of other keys.
- **Mnemonic Usage**: Explicitly noted for its use in mnemonics, facilitating quick command access.
- **Cross-Platform Identity**: Maintains a distinct identity (`Alt`) while being technically linked to the `Option` key via scancode, bridging different keyboard standards.
- **Global Standardization**: Recognized in over 30 Wikipedia language editions, indicating widespread global usage and terminology (e.g., `AltGr`, `Alttaste`).

## Body

### Classification and Definition
The Alt key is a subclass of the **modifier key**, which is a type of physical button on a computer keyboard designed to change the semantics or meaning of other keys when pressed in combination. It belongs to the broader category of computer keys and is an integral component of the computer keyboard device. Unlike primary input keys (such as alphabetic keys), the Alt key does not typically produce a character on its own; rather, it modifies the context of subsequent or simultaneous key presses.

### Core Functionality
The Alt key serves specific input roles distinct from other modifiers like Shift or Control:
*   **Special Characters**: It is used to type characters not present on the standard key layout.
*   **Menu Shortcuts**: It provides access to menu options within software interfaces (e.g., pressing `Alt+F` to open the "File" menu).
*   **System Commands**: In combination with other keys, it can execute system-level instructions.

This functionality places it within the ecosystem of efficiency tools that allow users to perform complex tasks with fewer keystrokes, a design philosophy ubiquitous across modern operating systems.

### Relationship to the Option Key
The Alt key has a complex relationship with the **Option key**. Structured data indicates that the Alt key is "different from" the Option key, reflecting their distinct naming conventions on different keyboard platforms (typically Windows vs. Apple). However, they are also "said to be the same as" each other based on the specific technical criterion of **scancode**. This means that while they may carry different labels and functional nuances depending on the operating system, they send identical electronic signals to the computer in certain contexts. The **AltGr** key is also listed as an alias for the Alt key in some contexts, primarily serving non-US keyboards to access special characters.

### Nomenclature and Aliases
The entity is recognized globally under various titles and aliases, reflecting its adaptation across different languages and regions:
*   **English**: Alt, Alternate
*   **German**: Alttaste, Alternativ-Taste, Alt (Taste)
*   **French**: Touche Alternative
*   **Spanish**: Tecla Alt
*   **Korean**: 알트 키, 앨트 키, 알트키, Alt키

### Identifiers and Digital Presence
The Alt key is extensively cataloged across knowledge bases and databases:
*   **Wikipedia**: The entity has a sitelink count of **34**, spanning languages such as Arabic, Catalan, Chinese, German, English, Spanish, French, Hebrew, Japanese, Korean, Russian, and Vietnamese.
*   **Technical IDs**: It is assigned the Babelnet ID `03552269n`, the Freebase ID `/m/033830`, and the Quora topic `Alt-Key`.
*   **Visuals**: Standardized icons and images for the key include `WikiMooc_Key_ALT_grey.svg`, `Key--Option_(1990s).svg`, and photographic images such as `Alt_-_Lenovo.jpg`.

## References

1. Freebase Data Dumps. 2013
2. BabelNet
3. Quora