The term 'very small quantities' can be summarized by the crossword solution 'IOTAS', which is a five-letter word. IOTAS are the smallest possible unit of a given quantity, and are often used to refer to very small amounts of something. In mathematics, an iota is a very small number, usually less than one. In physics, an iota is a unit of mass equal to one trillionth of a gram. In chemistry, an iota is a unit of energy equal to one trillionth of a joule. In finance, an iota is a unit of currency equal to one trillionth of a dollar. In general, an iota is a very small amount of something, and is often used to refer to very small quantities.