> For the complete documentation index, see [llms.txt](https://docs.internetobject.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.internetobject.org/structure-and-syntax/structural-elements/literals.md).

# Literals

Predefined constant values — booleans, null, and special numbers.

Literals are predefined constant values that represent common data states and special values. They offer a concise way to express boolean values, null states, and special numeric values without quotes or extra syntax.

## Supported literals

Internet Object supports the following literals:

| Literal | Type    | Represents                      | Case sensitive |
| ------- | ------- | ------------------------------- | -------------- |
| `true`  | Boolean | True value                      | Yes            |
| `T`     | Boolean | True value (short form)         | Yes            |
| `false` | Boolean | False value                     | Yes            |
| `F`     | Boolean | False value (short form)        | Yes            |
| `null`  | Null    | Null / empty value              | Yes            |
| `N`     | Null    | Null / empty value (short form) | Yes            |
| `Inf`   | Number  | Positive infinity               | Yes            |
| `-Inf`  | Number  | Negative infinity               | Yes            |
| `NaN`   | Number  | Not a Number                    | Yes            |

## Examples

```ruby
# Boolean literals
~ isActive: true, verified: F, isDeleted: false, visible: T

# Null literals
~ middleName: null, nickname: N

# Special numeric literals
~ maxValue: Inf, minValue: -Inf, result: NaN
```

## Rules

* **Case sensitive** — literals **MUST** use exact case; `True`, `FALSE`, and `NULL` are invalid.
* **No quotes** — literals are written without quotes; quoting one makes it an ordinary string.
* **Short forms** — `T`, `F`, and `N` are single-letter shortcuts for `true`, `false`, and `null`.

## See Also

* [Booleans](/structure-and-syntax/values/booleans.md) — the boolean type in detail
* [Nulls](/structure-and-syntax/values/null.md) — null and optional values
* [NaN and Infinity](/structure-and-syntax/values/number/nan-and-infinity.md) — special numeric values


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