core/homeassistant/components/snapcast/icons.json

{
  "services": {
    "join": {
      "service": "mdi:music-note-plus"
    },
    "unjoin": {
      "service": "mdi:music-note-minus"
    },
    "snapshot": {
      "service": "mdi:camera"
    },
    "restore": {
      "service": "mdi:camera-retake"
    },
    "set_latency": {
      "service": "mdi:camera-timer"
    }
  }
}