The greater than sign indicates that the opening faces left, and a larger number is in front of the opening. The less than sign indicates that the pen tip faces to the left, and a smaller number is in front of the pen tip.

2 > 1: Look at the openings. The spacing between the openings in the front is very large, and the back is only as small as a vertex. Obviously, the reading order from left to right is accustomed to the fact that the front is greater than the back, so > is greater than the symbol. 1 < 2: Look at the opening. On the contrary, the front is only as small as a vertex, and the distance between the openings in the back is very large. Obviously, according to the reading order from left to right, the front is smaller than the back, so