The Old and New Meanings of Cloud 'Belt' and 'Zone': A Study of Jovian   and Saturnian Atmospheric Banding
  The brightness of cloud bands on Jupiter and Saturn as a function of latitude is reported. Bright Jovian bands near the equator are located in regions of anti-cyclonic circulation of the atmosphere. By contrast, bright equatorial bands on Saturn are associated with cyclonic motion. Modern definitions of the cloud band terms 'zone' and 'belt' are distinguished from their old meanings. 
Anthony Mallama
astro-ph.EP