What constellation does careful skating belong to?

The sign of careful sliding reminds people that the ground is smooth, the sliding friction is small, and it is easy to fall, so careful sliding is a safety sign.

Safety sign: a sign used to express specific safety information, which consists of graphic symbols, safety colors, geometric borders or words. Safety signs are signs that warn workers of dangerous situations in the workplace or the surrounding environment and guide people to take reasonable actions. Safety signs can remind staff to prevent danger, thus avoiding accidents; When danger occurs, it can instruct people to flee as soon as possible, or instruct people to take correct, effective and powerful measures to contain the harm. Safety signs should not only match the warning content, but also be set in a correct and reasonable position, otherwise it will be difficult to give full play to its warning function.