The term THREE-DAY HOLIDAY is often used to refer to a three-day weekend, which is a period of three days that includes a public holiday. In many countries, the three-day weekend is a popular way to take a break from work and spend time with family and friends. The term TET is an abbreviation for Tet Nguyen Dan, which is the Vietnamese Lunar New Year celebration. It is a three-day holiday that is celebrated in Vietnam and other countries with large Vietnamese populations.