When it comes to the world of school supplies, it is impossible not to mention the lame compass. The compass has entered the newspaper, the lesson as a useful tool for all generations of students. Compa now has many different designs, materials, beautiful colors.  The compass has two legs. One foot is the center, fixed and cannot be moved. At one end is designed with a small iron shaft that is sharp, but not too sharp. This sharp tip can still cause injury, but it must be stabbed directly with strong force to cause injury. The other leg of the compass is designed quite like the other leg, but with different points. It is permanently paired with the other leg but is designed to be movable. This leg can extend far or near the length of the other leg along the axis, which is the joint that fixes the two legs on the top of the compass. The other end of the compass has a small place to attach a pencil, with a pencil holder across the shaft.  To meet the learning needs of students, the compass is increasingly improved with many beautiful designs. After so many generations of students, the compass has always been a companion to Vietnamese students.