the sum of squares (SS), the result is called the mean square (MS) and the squared terms are deviations from the sample mean.
ðə sˈʌm ʌv skwˈɛɹz ˌɛsˈɛs, ðə ɹɪzˈʌlt ɪz kˈɔːld ðə mˈiːn skwˈɛɹ ˌɛmˈɛs ænd ðə skwˈɛɹd tˈɜːmz ɑːɹ dˌiːvɪˈeɪʃənz fɹʌmðə sˈæmpəl mˈiːn.