The term 'Little Wonder' can be solved by the four-letter word 'ATOM'. The term 'Little Wonder' is often used to refer to the ATOM, which is the smallest particle of an element that still retains its chemical properties. The ATOM is a fundamental building block of all matter and is composed of protons, neutrons, and electrons. It is the smallest unit of matter that can exist in nature and is the basis for all chemical reactions.