> For the complete documentation index, see [llms.txt](https://developers.felt.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developers.felt.com/felt-style-language/icons.md).

# Icons

Point layers can be drawn as icons instead of plain circles. Set `iconImage` in the `paint` block to a built-in icon slug (or an emoji), and the icon takes on the layer's `color` and `size`.

Icons work in [simple](/felt-style-language/types-of-visualizations/simple-visualizations.md), [categorical](/felt-style-language/types-of-visualizations/categorical-visualizations.md), and [numeric](/felt-style-language/types-of-visualizations/numeric-visualizations-color-and-size.md) point visualizations. In categorical and numeric styles, `iconImage` (and the other paint properties) may be an array so each category or class gets its own marker.

## Icon paint properties

| Property         | Type                | Description                                                                        |
| ---------------- | ------------------- | ---------------------------------------------------------------------------------- |
| `iconImage`      | string \| string\[] | An icon slug from the catalog below, or an emoji in the form `"emoji::name:"`.     |
| `iconFrame`      | string              | `"none"`, `"frame-circle"`, or `"frame-square"`. Built-in icons only (not emojis). |
| `iconRotation`   | number \| string    | Rotation in degrees, or the name of a column to rotate by.                         |
| `iconHideOnZoom` | number              | Zoom level below which icons are drawn as plain points instead. Optional.          |

When `iconImage` is set, `color` fills the icon and `size` scales it (the same `size` you would use for a circle radius).

## Examples

A single icon marker, framed in a circle:

```json
{
  "version": "2.3.1",
  "type": "simple",
  "paint": {
    "iconImage": "hospital",
    "iconFrame": "frame-circle",
    "color": "#E74C3C",
    "size": 4,
    "opacity": 0.9,
    "isClickable": true
  },
  "legend": {}
}
```

To give each category its own icon, make `iconImage` an array — see the icon-per-category example in [Categorical visualizations](/felt-style-language/types-of-visualizations/categorical-visualizations.md).

## Available icons

{% hint style="warning" %}
Use only the icon slugs listed here. Invented names will not render.
{% endhint %}

* **Shapes**: `dot`, `square`, `diamond`, `triangle`, `x`, `plus`, `circle-line`, `circle-slash`, `star`, `heart`, `hexagon`, `octagon`
* **Arrows & directions**: `arrow-up`, `chevron-up`, `double-chevron-up`, `direction-up` (combine with `iconRotation` to point them anywhere)
* **Transportation**: `pedestrian`, `bicycle`, `wheelchair`, `airport`, `car`, `bus`, `train`, `truck`, `ferry`, `sailboat`, `electric-service`, `gas-service`, `blood-clinic`, `badge`, `traffic-light`, `traffic-cone`, `road-sign-caution`
* **Activities & places**: `person`, `restroom`, `house`, `work`, `letter`, `hotel`, `factory`, `hospital`, `religious-facility`, `school`, `government`, `university`, `library`, `bank`, `landmark`, `museum`, `clothing`, `shopping`, `store`, `bar`, `pub`, `cafe`, `food`, `park`, `amusement-park`, `camping-tent`, `cabin`, `picnic`, `water-refill`, `trailhead`, `guidepost`, `viewpoint`, `camera`, `us-football`, `football`, `tennis`, `binoculars`, `swimming`
* **Infrastructure**: `zap`, `battery-full`, `battery-half`, `battery-low`, `boom`, `radar`, `wind-turbine`, `solar-panel`, `antenna`, `telephone-pole`, `oil-well`, `oil-barrel`, `railroad-track`, `bridge`, `lighthouse`, `lock-closed`, `lock-open`, `wifi`, `trash`, `recycle`
* **Nature**: `tree`, `flower`, `leaf`, `fire`, `mountain`, `snowy-mountain`, `volcano`, `island`, `wave`, `hot-springs`, `water`, `lake`, `ocean`, `animal`, `bird`, `duck`, `dog`, `fish`, `beach`, `wetland`
* **Weather**: `sun`, `moon`, `cloud`, `partial-sun`, `rain`, `lightning`, `snowflake`, `wind`, `snow`, `fog`, `sleet`, `hurricane`
* **Signs**: `warning`, `parking`, `info`, `circle-exclamation`

## Emojis

To use an emoji as a marker, write it as `"emoji::name:"` — note the double colon after `emoji` and the trailing colon. For example: `"emoji::fire:"`, `"emoji::tree:"`. `iconFrame` does not apply to emojis. Prefer built-in icons unless an emoji is specifically requested.

```json
{
  "version": "2.3.1",
  "type": "simple",
  "paint": {
    "iconImage": "emoji::fire:",
    "size": 6
  },
  "legend": {}
}
```


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