Millisecond (ms)
The millisecond, symbol ms, is one-thousandth of a second. It is important to time very short periods. The millisecond, a unit of measurement in the metric system, is used in science, computers, and engineering. It measures speeds and response times in digital devices. People’s reaction times are often measured in milliseconds, making it useful in medicine, sports, and psychology. Its accuracy helps capture events that happen too fast for the eye to see.
Week (wk)
The week, symbolized by wk, is 7 days long. Its history is rooted in ancient traditions, including Babylonian, Jewish, and Roman customs. The seven-day week originated because of religion and culture, and later became established through Christianity and Islam. Although the week is not based on astronomy, it is now widely used in calendars and daily life. Its long use shows how strong traditions are in setting time.