Microsecond (µs)
The microsecond, symbolized as µs, is one millionth of a second. This very short time is important in electronics, communication, and research. Microseconds are used to measure signal delays, computer speeds, and fast changes. As digital technology grew in the 1900s, measuring microseconds became necessary. Today, this accuracy supports applications such as fast trading, medical imaging, and satellite communications.
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.