core/homeassistant/components/bosch_shc/icons.json

{
  "entity": {
    "sensor": {
      "purity": {
        "default": "mdi:molecule-co2"
      },
      "communication_quality": {
        "default": "mdi:wifi"
      },
      "valvetappet": {
        "default": "mdi:gauge"
      }
    },
    "switch": {
      "routing": {
        "default": "mdi:wifi"
      }
    }
  }
}