SIGMA /ˈsɪɡmə/ ► audio Scrabble 8 Words With Friends 10 Scrabble letter values: S1I1G2M3A1 = 8 Definition noun the 18th letter of the Greek alphabet. Anagrams of SIGMA agism See all 29 words you can make from SIGMA → 5-letter words Words starting with S Words ending with A ← Unscramble different letters