The term 'LARGEST DIGITS IN BINARY' can be solved by the word 'ONES', which is a four-letter word. In binary, the largest digits are ONES, which are represented by the number 1. Binary is a base-2 number system that uses only two digits, 0 and 1, to represent all numbers. This system is used in computers and digital electronics because it is easier for machines to process than the traditional base-10 number system.