Except for a few signs, the colors of prohibition signs are white background, red circle, red bar and black pattern. Embossing rod. The shape of the prohibition sign is round, octagonal and equilateral triangle with downward vertex. There are currently 42 prohibited signs.

2. Olympic symbol.

The Olympic symbol, also known as the Olympic rings symbol, is the most widely known Olympic symbol in the world. It consists of five Olympic rings, blue, yellow, black, green and red. The rings are nested from left to right, with blue, black and red rings above and yellow and green rings below. The overall shape is a regular trapezoid with a small bottom.

3, the national water-saving signs

The green circle represents the earth, symbolizing that saving water is an important measure to protect the earth's ecology. The blank part of the sign is like a hand holding up a drop of water. Hand is a variant of the pinyin letter JS, which means saving water, indicating that saving water requires public participation, encouraging people to start from me and saving every drop of water. The hand is like a winding river, symbolizing that water drops converge into a river.

4. Mercedes-Benz logo

The Trident Star of Mercedes-Benz symbolizes the desire to conquer land, sea and air. This logo was produced after the merger of Daimler and Mercedes-Benz. Daimler's original trademark is three-pointed star, and Mercedes-Benz's trademark is double-circle "Mercedes-Benz". After the merger of the two, Daimler-Benz's trademark is a three-pointed star in a single circle.

5. Audi logo

Audi's logo design is a pattern composed of four rings. It is regarded as the union of the four companies, hand in hand and making great achievements, which fully embodies the mass enterprise culture of "unity is strength".