Jisho

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Noun
1. abacus; sorobanUsually written using kana alone
Noun
2. calculation (esp. of profit and loss); reckoningUsually written using kana alone
Other forms
十露盤 【そろばん】珠盤 【そろばん】ソロバン
Notes
十露盤: Rarely-used kanji form. 珠盤: Rarely-used kanji form.

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