Parallel retouch type is the detachment of long, thin, evenly spaced removals (Bordes 1961, 9-10; Tixier, Inizan and Roche 1980, 92). This is normally considered to be restricted to use in producing more elaborate tool types, such as daggers or knives.
This type of retouch can be applied to produce a number of special effects, particularly when it is placed obliquely, transversely or in the form of a chevron.