Answer: placeholder
AnswerCrossword Clue
placeholderA symbol or piece of text used in a mathematical expression or in an instruction in a computer program to denote a missing quantity or operator
placeholderA significant zero in the decimal representation of a number
placeholderAn element of a sentence that is required by syntactic constraints but carries little or no semantic information, for example the word it as a subject in it is a pity that she left, where the true subject is that she left
placeholdera symbol in a mathematical or logical expression that may be replaced by the name of any element of a set