On grammatical class:

semi-mathematical binary operator: named number base operator/interpreter

In definition:

terminates a JUhAU expression

In notes:

mekso at-most-4-ary operator: a rounding function; ordered input list is (x,n,m,t) and the output is b(-t) × round(bt × x), with rounding preference n and where the fractional part of bt × x being 1/2 causes the function to map bt × x to the nearest integer of form 2Z+m, for base b and an integer Z determined by context