西格玛

sigma (Greek letter Σσ) / (symbol for standard deviation in statistics)

the West / abbr. for Spain 西班牙[Xi1 ban1 ya2] / Spanish

square / frame / rule / (legal) case / style / character / standard / pattern / (grammar) case / (classical) to obstruct / to hinder / (classical) to arrive / to come / (classical) to investigate / to study exhaustively

agate / cornelian

agate; cornelian