core/homeassistant/components/simplisafe/icons.json

{
  "services": {
    "remove_pin": {
      "service": "mdi:alarm-panel-outline"
    },
    "set_pin": {
      "service": "mdi:alarm-panel"
    },
    "set_system_properties": {
      "service": "mdi:cog"
    }
  }
}