USE SHAPE, TEXTURE, AND SIZE CODING
FOR CONTROLS
• Shape coding, using two- or three-dimensional geometric configurations,
permits both tactual and visual identification.
• It is especially useful under low-light conditions or in situations where
redundant or double-quality identification is desirable, thus helping to
minimize errors.
• Multiple rotation knobs are used for continuous controls in which the
adjustment range is more than one full turn.
• Fractional rotation knobs are used for continuous controls with a range
less than a full turn, while detent positioning knobs are for discrete
settings.