The term 'Minuscule Bit' can be broken down into two crossword solutions: ATOM (4 letters) and IOTA (4 letters). ATOM is a term used in chemistry to describe the smallest particle of an element that still retains its chemical properties. IOTA is a Greek letter that is used in mathematics and science to represent a very small quantity or amount. Together, these two terms can be used to describe a minuscule bit, or a very small amount.