core/homeassistant/components/lawn_mower/icons.json

{
  "entity_component": {
    "_": {
      "default": "mdi:robot-mower"
    }
  },
  "services": {
    "dock": {
      "service": "mdi:home-import-outline"
    },
    "pause": {
      "service": "mdi:pause"
    },
    "start_mowing": {
      "service": "mdi:play"
    }
  }
}