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Samjinnal is one of sesi pungsok (세시풍속) or Korean traditional customs by season which falls on every March 3 in the lunar calendar. It was called samjil (삼질) in old Korean language and referred to as sangsa (상사 上巳) wonsa (원사 元巳) sungsam (중삼 重三) sangje (상제 上除) or dapcheongjeol (답청절 踏靑節) in hanja. Samjinnal implies the overlapping of Sam (three). According to Choi Namseon samjil was derived from the consonants of Samil and Sangsa is defined as the first snake day of the 3rd lunar month.