The term HIGHEST UNSTRIPED BALL can be solved by the crossword solution EIGHT, which is a five-letter word. The word 'EIGHT' is a cardinal number that is equal to seven plus one. It is the first number after seven and the first non-prime number. In mathematics, it is considered a composite number, meaning it is the product of two smaller numbers. In the English language, it is the smallest non-single digit number with a unique name.