ALPHA(AL-fuh)First letter of the Greek alphabet.
EPSILON(EP-sil-on)The second form of the lower case epsilon is used as the "set membership" symbol.
OMICRON(OM-i-KRON)Rarely used because it looks like an 'o.'
PI(PIE)The lower-case Pi is universally used to represent that number which is the ratio of the circumference of a circle to its diameter. The upper-case Pi is used as the "product" symbol.
SIGMA(SIG-muh)The capital Sigma is used as the "summation" symbol.
PHI(FEE)The two versions of lower-case Phi are used interchangeably.
OMEGA(oh-MAY-guh)Last letter of the Greek alphabet.