sigma fieldsigma notationsigma scoresigma unitsignsign of equalitysign of membershipsign of permutationsign preserving propertysign testsignalsignal flowsignal wavesignaturesignature of a permutationsignedsigned measuresigned numbersigned ranksigned rank statisticssigned rank testsignificancesignificance levelsignificance level of a testsignificance probabilitysignificantsignificant differencesignificant digitsignificant digitssignificant figuresignificant figuressignificant probabilitysignificationsignify thatsignt billsignumsignum functionsilicon chipssimilarsimilar arcssimilar figuresimilar figuressimilar fractionssimilar matricessimilar matrixsimilar ordered setssimilar permutationssimilar polygonssimilar polyhedronssimilar set
