hexad
set or group of six entities
sestet
name given to the second division of an Italian sonnet (as opposed to an English or Spenserian Sonnet), which must consist of an octave, of eight lines, succeeded by a sestet, of six lines; six lines of poetry forming a stanza or complete poem
Six Edicts
series of edicts by Anne Robert Jacques Turgot (1776)
Big Six
group of six civil rights leaders in 1963 in the United States