This is the 2511th most frequent Chinese word.
标志
"标志" means "sign, symbol, or mark."
Here, "标志" is used to mean a symbol or emblem that represents something significant. In this context, it denotes the representation of the city by the building.
这座建筑是这座城市的一个标志。
This building is a symbol of this city.
In this sentence, "标志" means a sign or indicator conveying a message or instruction. It describes the function of the traffic signal.
红灯是停车的标志。
The red light is a sign to stop.
Here, "标志" refers to a manifestation or marker of a characteristic or action. It signifies that the achievement represents his dedication.