The term 'LOW MARK' can be solved in a crossword puzzle with the answers 'DEE' (3 letters) and 'DPLUS' (5 letters). 'DEE' is an abbreviation for the word 'DEFICIENT', which means not meeting the required standard. 'DPLUS' is an abbreviation for the phrase 'dismal plus', which is a grade given to a student who has performed poorly on an assignment or test. Together, these two answers indicate that the term 'LOW MARK' refers to a grade that is below the expected standard.