The field of a shield, or less often a charge or crest, is sometimes made up of a pattern of colours, or "variation". A pattern of horizontal (barwise) stripes, for example, is called "barry", while a pattern of vertical (palewise) stripes is called "paly". A pattern of diagonal stripes may be called "bendy" or "bendy sinister", depending on the direction of the stripes. Other variations include "chevrony", "gyronny" and "chequy". Wave shaped stripes are termed "undy". For further variations, these are sometimes combined to produce patterns of "barry-bendy", "paly-bendy", "lozengy" and "fusilly". Semés, or patterns of repeated charges, are also considered variations of the field. The Rule of tincture applies to all semés and variations of the field.