core/homeassistant/components/motion_blinds/icons.json

{
  "entity": {
    "button": {
      "go_favorite": {
        "default": "mdi:star"
      },
      "set_favorite": {
        "default": "mdi:star-cog"
      }
    }
  },
  "services": {
    "set_absolute_position": {
      "service": "mdi:set-square"
    }
  }
}