core/homeassistant/components/hdmi_cec/icons.json

{
  "services": {
    "power_on": "mdi:power",
    "select_device": "mdi:television",
    "send_command": "mdi:console",
    "standby": "mdi:power-standby",
    "update": "mdi:update",
    "volume": "mdi:volume-high"
  }
}