Sigma - Greek letter Sigma - Greek s Sigma - ___ alpha epsilon fraternity Sigma - Standard deviation symbol Sigma - Symbol of conductivity Sigma - Science society ___ xi Sigma - ___ society (super-high i.q. group) Sigma - Letter after rho Sigma - Part of some frat names Sigma - Rho follower Sigma - Frat letter Sigma - Calculus symbol Sigma - Character in "the iliad" Sigma - 18th letter of the greek alphabet Sigma - Letter between rho and tau Sigma - 18th greek letter Sigma - Arithmetic series symbol Sigma - Tau precursor Sigma - It's halfway between pi and upsilon Sigma - Fraternity letter Sigma - Sum symbol, in math Sigma - Sum symbol Sigma - Summation symbol Sigma - Symbol in a riemann sum Sigma - Start for sophocles? Sigma - Tau preceder Sigma - Summation signifier, in math Sigma - Greek consonant Sigma - 'the sweetheart of -- chi' Sigma - The american serviceman's got back to his mother with a letter from greece Sigma - The greek 's' Sigma - The 18th letter of the greek alphabet Sigma - Greek letter `s' Sigma - "the sweetheart of ___ chi" Sigma - Agism of the greek letter Sigma - Letter on a house used by 4-across Sigma - Head of ancient sparta? Sigma - S, as in socrates Sigma - Greek 's' Sigma - Summation symbol in math Sigma - Brand without the t that comes before it Sigma - Freud dismissed german and added to 'a letter to plato' Sigma - One of those letters from abroad soldiers sent back to mum Sigma - Father and son writing up about first of grecians - or his character? Sigma - A classic car is back, of classic character Sigma - Writer reflected over first greek letter Sigma - Greek letter corresponding to s Sigma - Greek letter s Sigma - Sorority letter Sigma - Disgrace with loss of model character Sigma - Letter in some fraternity names Sigma - Author returns to pen good, classical letter Sigma - What it all adds up to in greek? Sigma - Sophocle's initial Sigma - Sum symbol in math Sigma - Character shown in extremities by sophocles Sigma - A thousand soldiers backed local opening in salonika Sigma - Gr. letter; rhymes with mark of disgrace Sigma - Greek letter indicating summation in maths Sigma - American soldier's sent back letter Sigma - Whichever way you look at it, the end of socrates Sigma - Greek letter signifying sum in maths Sigma - Letter from athens dismissing tour leader in disgrace Sigma - Allowing no relaxation Sigma - How socrates ended - in disgrace, no end of it Sigma - Greek character drops temperature in part of plant Sigma - Greek letter used as summation sign Sigma - Character going to extremes in sophocles Sigma - Conclusion reached by aristophanes, sophocles, and euripides Sigma - ... several of whom repulsed character from europe Sigma - Bring up a girl, briefly inculcating good character Sigma - Letter american servicemen returned Sigma - Letter from greece turning up a manuscript on a soldier Sigma - Greek version of the origin of species Sigma - A male, one in g and s, all-round character? Sigma - Character central to the writing of aesop Sigma - Bad mark, losing second character abroad Sigma - S, for socrates Sigma - Rho-tau linkup Sigma - Greek letter used as a symbol for summation Sigma - Letter from greece is sent up with note to mother Sigma - Letter about gas, i�m perplexed Sigma - The eighteenth letter of the greek alphabet Sigma - Foreign character's scar dermatologist finally removed Sigma - Greek character is back with good degree Sigma - Disgrace, having no time for greek character Sigma - With 65-down, 160-year-old fraternity founded at miami university of ohio Sigma - Drops tenor in shame with greek letter Sigma - Greek character has gas? i'm off! Sigma - Greek character writing name (martin?) backwards, minimum of greek in it Sigma - In the morning soldiers knocked over character in athens Sigma - Letter before tau Sigma - Summation symbol, in math Sigma - Letter before 7-down Sigma - Frat house letter Sigma - Sophocles's initial, to sophocles Sigma - Certain greek letter Sigma - What sounds like a fag, postgraduate producing letter in greek Sigma - Six ___ (quality assurance term) Sigma - What archimedes was finished with