What Is Sigma Meaning? 7 Clear Definitions You Must Know
Author / TrustWritten by Jordan Blake, M.A. in Linguistics | Fact-checked by Priya Shah, Lean Six Sigma Green Belt | Last updated August 19, 2026 Sigma meaning changes with the field you study. In Greek, it names a letter. In math, it signals summation and standard deviation. In business, it anchors Six Sigma quality control….