core/homeassistant/components/snapcast/icons.json

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