A system of measurement is a set of units which can be used to specify anything which can be measured and were historically important, regulated and defined because of trade and internal commerce. In modern systems of measurement, some quantities are designated as fundamental units, meaning all other needed units can be derived from them, whereas in the early and most historic eras, the units were given by fiat (see statutory law) by the ruling entities and were not necessarily well inter-related or self-consistent.
Zeng Jinlian (simplified Chinese: 曾金莲; traditional Chinese: 曾金蓮; pinyin: Zēng Jīnlián; June 25, 1964 – February 13, 1982) was the tallest woman ever verified in medical history, taking over Jane Bunford's record. Zeng is also the only woman counted among the 14 people who have reached verified heights of eight feet or more.
At the time of her death at the age of 17 in Hunan, China, Zeng, who would have been 8 feet, 1.75 inches tall (she could not stand straight because of a severely deformed spine), was the tallest person in the world. She had also broken Robert Wadlow's previous record of tallest 17 year-old ever. In the year between Don Koehler's death and her own, she surpassed fellow "eight-footers" Gabriel Estêvão Monjane and Suleiman Ali Nashnush. That Zeng's growth patterns mirrored those of Robert Wadlow is shown in the table below.
Many different units of length have been used around the world. The main units in modern use are U.S. customary units in the United States and the Metric system elsewhere. British Imperial units are still used for some purposes in the United Kingdom and some other countries. The metric system is sub-divided into SI and non-SI units.
The base unit in the International System of Units (SI) is the metre, defined as "the length of the path travelled by light in vacuum during a time interval of 1/299,792,458 of a second." It is approximately equal to 1.0936 yards. Other units are derived from the metre by adding prefixes from the table below:
A rack unit, U or RU is a unit of measure that describes the height of equipment designed to mount in a 19-inch rack or a 23-inch rack. The 19-inch (482.6 mm) or 23-inch (584.2 mm) dimension refers to the width of the equipment mounting frame in the rack including the frame; the width of the equipment that can be mounted inside the rack is less). One rack unit is 1.75 inches (44.45 mm) high.
The size of a piece of rack-mounted equipment is frequently described as a number in "U". For example, one rack unit is often referred to as "1U", 2 rack units as "2U" and so on.
The term crime does not, in modern times, have any simple and universally accepted definition, but one definition is that a crime, also called an offence or a criminal offence, is an act harmful not only to some individual, but also to the community or the state (a public wrong). Such acts are forbidden and punishable by law.