Tianjin Metro Golden Shield will display a sign when riding in Tianjin Metro, that is, as long as the COVID-19 vaccination is completed, the health code will appear similar to the shield-shaped Phnom Penh pattern when riding, which is called the Golden Shield Code. Tianjin Metro refers to the subway station in Tianjin, and Golden Shield refers to the Phnom Penh pattern similar to a shield when you scan the health code when you travel, so together, a sign will be displayed when you travel in Tianjin Metro, that is, as long as you complete the COVID-19 vaccination, a Phnom Penh pattern similar to a shield will appear when you scan the health code when you travel, called Golden Shield Code.