China Naming Network - Ziwei Dou Shu - What does the two silver-plated marks on a zippo lighter mean?

What does the two silver-plated marks on a zippo lighter mean?

Material. The two signs of silver-plated zippo lighters indicate that the lighter is made of silver-plated material. Zippo (Chinese name is Zippo, Zhibao) is a metal lighter manufactured by the American Zippo company. Zippo's windproof technology can meet the need for ignition at any time in any bad weather.