In particle physics, strangeness, denoted as S, is a property of particles, expressed as a quantum number for describing decay of particles in strong and electro-magnetic reactions, which occur in a short period of time. The strangeness of a particle is defined as: » S = N_s - N_) and N_s represents the number of strange quarks. The derivation of the phrase "strange" or "strangeness" precedes the discovery of the quark, and was adopted after its discovery in order to preserve the continuity of… (More on Strangeness)