core/homeassistant/components/harmony/icons.json

{
  "entity": {
    "select": {
      "activities": {
        "default": "mdi:remote-tv",
        "state": {
          "power_off": "mdi:remote-tv-off"
        }
      }
    }
  },
  "services": {
    "sync": {
      "service": "mdi:sync"
    },
    "change_channel": {
      "service": "mdi:remote-tv"
    }
  }
}