What does lightning on a telephone pole mean?

Danger of high voltage, beware of electric shock. The lightning pattern on the telephone pole indicates the danger of high voltage, so be careful to get an electric shock. There will be a big black triangle around a black lightning sign in the sign, and there will be slogans and text reminders below. Such signs are generally placed or hung in transformers, power distribution rooms, high-voltage towers, power distribution cabinets, telephone poles and other places to remind people to prevent electric shock.