Notes: Sebastian is a name with Greek origins. The meaning of the name Sebastian is venerable. Alternate spellings include Sabastian and Sebastion. Common nicknames include Seb, Bas, Bash, and Subby.
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Both the abacus and the counting board are mechanical aids used for counting; they are not calculators in the sense we use the word today. The person operating the abacus performs calculations in their head and uses the abacus as a physical aid to keep track of the sums, the carrys, etc.