adjust_hue($color, $degrees) Changes the hue of a color. Takes a color and a number of degrees (usually between -360deg

max($numbers...) Finds the maximum of several numbers. This function takes any number of arguments.

counter($args...) This function only exists as a workaround for IE7‘s

unit($number) Returns the unit(s) associated with a number. Complex units are sorted in alphabetical order by numerator and

map_merge($map1, $map2) Merges two maps together into a new map. Keys in $map2 will take precedence over keys

mixin_exists($name) Check whether a mixin with the given name exists.

type_of($value) Returns the type of a value.

inspect($value) Return a string containing the value as its Sass representation.

round($number) Rounds a number to the nearest whole number.

grayscale($color) Converts a color to grayscale. This is identical to desaturate(color, 100%).