what does the tr stand for in $qn$ what does $q mean what is $q_n$ what is qn$ terminology what do you mean by the word qn$ what does the term $q_n$ mean? what is $q_n$ mean what is the terminology of $qn$ what does $q mean what does $q_n$ mean $k$ what does this mean which terminology does $q_n$ refer to? what does the word qn$ means what does $q_n$ mean what does $q_n$ mean? what does $q_n$ mean? what does $q_n$ mean what does $m = what is the terminology of $q$ what is $qn$