What is the function and structure of abacus?

The periphery of the abacus is called the frame, also called the edge.

The rod in the middle of the abacus is called a beam.

The small stick that the abacus passes through the beam from top to bottom is called a gear, also called a "rod".

Usually nine to fifteen gears. Each file represents a number. When calculating, you can choose a gear as the unit. Counting from this file to the left, it is ten, one hundred, one thousand, ten thousand, ..., which is 10 percentage point to the right of everyone.

The beads on the abacus are called abacus beads, also called abacus.

Generally, there are 5 beads and 4 beads under the beam. Each bead represents a unit.

The lower bead near the bottom of the abacus is called the bottom bead.

Generally, there are two beads on the beam, and some abacus has only one bead. Each upper bead is equal to five lower beads in the same file.

The top bead near the abacus is called the top bead.