五ご玉だま

noun

soroban bead with value five

Refers specifically to the upper bead on a soroban (abacus) that represents the value five. Used in abacus instruction and related contexts.

See also: そろばん

• そろばんでは、五ご玉だまを一ひとつ下さげると五ごを表あらわす。

  On the soroban, moving one five-bead down represents five.