EntityQ1666865· pop 6· linked from 45 articlesmathematical instrumentSign in to savetool used in the study or practice of mathematicsConnectionsmathematicsEntityastronomyEntitygeometryEntityalgebraEntityarithmeticEntityInternational Standard Book NumberEntitycalculatorEntityabacusEntityapplied mathematicsEntitynavigationEntityrulerEntitycompassEntityastrolabeEntitysextantEntityslide ruleEntitysurveyingEntitycaliperEntitygoniometerEntityquadrantEntityset squareEntityCategoriesMathematical tools