What are the different types of abacuses?

There are several types of abacuses, each designed for different purposes and cultures. The most common include the traditional Chinese abacus (suanpan), which features two beads above and five beads below each rod, and the Japanese soroban, which has one bead above and four beads below. The Russian abacus, or schoty, typically has a different bead arrangement and is used for various arithmetic calculations. Additionally, there are modern variations, such as digital or educational abacuses, which are used to teach basic arithmetic concepts.