Very small amounts can be referred to as IOTAS, tads, mites, and WHITS. IOTAS are the smallest Greek letter and is used to refer to a very small amount or quantity. Tads are a slang term for a small amount, usually referring to money. Mites are a biblical term for a very small amount, often used in reference to coins. Lastly, WHITS are a Scottish term for a tiny amount of something. All of these terms can be used to refer to very small amounts.