Sigma

Sorority letter name

Sigma is a common element in Greek letter organization names—fraternities, sororities, and honor societies: Phi Beta Sigma, Sigma Chi, Sigma Alpha Epsilon.

It also appears as a brand name, notably Sigma lenses in photography. (Lowercase sigma is the Greek letter and internet slang term.)

fraternity

sorority

Women's collegiate social organization

brotherhoodKinship among men
sisterhoodBond among women
pledgeBinding promise given

rush · chapter · recruitment · initiation · formal · philanthropy · alumnae · legacy · mixer · intramurals

brand

lens

Light-focusing curved glass

cameraImage capturing device
photographyCreating images from light
opticsScience of illumination

equipment

Categories

hyperonsLambda, Xi, cascade
Mega ManMega Man, Bass, Eddie, Mega Man X
MitsubishiMirage, Triton, Colt, Endeavor, Challenger
Music BrandsFender, Gibson, Yamaha, Roland, Martin
Plumbing BrandsKohler, Moen, Delta, American Standard, Glacier Bay
Video Game BossesGanondorf, Dr. Robotnik, Ganon, final boss, Ridley

Opposites

Greek alphabet position

Sigmabeta

Greek alphabet's second letter

beta male · alpha · normie · follower · omega

statistical meaning (summation/standard deviation)

Sigmadelta

Symbol denoting variation

derivative · differentiation · subtraction · division

statistical role (standard deviation vs. central tendency)

Sigmamu

Greek alphabet's twelfth character

mean · average · median · mode · expected value

Phrases

sigma maleSolitary, self-sufficient man
Six SigmaData-driven quality management

Family

sigmas

Familiarity: Top 500,000
Profile: Used worldwide · Timeless · Rated G