From the Latin unĭtas, the word unity allows to name a certain property of things that is related to the impossibility of division or separation. Therefore, it is not possible to divide or separate a unit without modifying its integrity or essence.
For example: “In the insurance policy, the dwelling is considered a unit, in addition to its various rooms and spaces” , “I will bring three units of this article” , “Our government will defend the territorial unit of the State . ” The unit is also unique in terms of quantity, numbering or specificity: “We sell forty units of this model” , “There are no more units, we will have to contact the supplier” . Other uses of the concept appear in mathematics, the military sphere, and urban planning. For mathematics, the unit is a quantity that allows comparisons or measurements to be made with other things of the same characteristics. In the military sphere, it is a division or group that is part of the Armed Forces. As far as urban planning is concerned, the dwellings that make up a building are known as units and are called, depending on the country, as apartments, apartments or flats.
Focusing on the military field, we can emphasize that any unit of this type, as an integral part of the aforementioned Armed Forces of a country, is constituted by a set of human and material resources that give it meaning and that also allow function as expected to achieve the stated objectives. In this sense, we can emphasize that each military unit mentioned is composed of aerial vehicles, whether helicopters or planes, as well as means of land transport, ships, the respective commanders and soldiers, or the respective weapons. When the notion of unit of measure is used, it refers to a quantity that, after obtaining its valuation according to a parameter or other previously defined units, reflects a certain physical quantity. In this way, it can be established that there is even an International System of Units, which is the one that establishes the units that must be used to measure the various existing magnitudes. In this case, there are seven: temperature, length, time, amount of substance, mass, electrical intensity or light intensity. As examples, we find the fact that to measure length there are several units that can be used as we are interested and that they are all related. This would be the case with the millimeter, centimeter, meter, kilometer, mile or light year. And the same happens, for example, in the measurement of time because we have universal units like the second, the minute or the hour. However, the basic unit to perform this function is the aforementioned second one. As for the notion of a disk drive, it is a term that, in computing, refers to devices that allow writing or reading on different types of discs (such as a CD, a DVD or another format).