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One bead above, four below.
Also known as: Japanese abacus notation, One-four bead abacus
The Japanese abacus arrangement, reduced from the Chinese form to one upper and four lower beads.
Represents decimal digits with one five-bead and four unit beads to a rod.
Contexts: Mathematics, Technical drawing
Reduced from the Chinese two-and-five arrangement, which could represent digits above nine and so allowed intermediate states the decimal result did not need — the Japanese form removes the redundancy and forces every rod to hold a single decimal digit.
Contexts: Mathematics, Technical drawing
Parallel rods each carrying one bead above the bar and four below it, in place of the Chinese two-and-five arrangement.
The Japanese soroban reduces the Chinese bead arrangement to one upper and four lower beads.