Information: - The metric system is an internationally agreed decimal system of measurement. It was originally based on the and the introduced by the French First Republic in 1799, but over the years the definitions of the metre and the kilogram have been refined, and the metric system has been extended to incorporate many more units. Although a number of variants of the metric system emerged in the late nineteenth and early twentieth centuries, the term is now often used as a synonym for "SI" or the "International System of Units"the official system of measurement in almost every country in the world. - Metrology is the science of measurement and includes all theoretical and practical aspects of measurement. - The International Committee for Weights and Measures (abbreviated CIPM from the French Comite international des poids et mesures) consists of eighteen persons from Member States of the Metre Convention ("Convention du Metre") appointed by the General Conference on Weights and Measures (CGPM) whose principal task is to ensure world-wide uniformity in units of measurement by direct action or by submitting proposals to the CGPM. - A unit of measurement is a definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same quantity. Any other value of that quantity can be expressed as a simple multiple of the unit of measurement. - A symbol is a mark, sign, or word that indicates, signifies, or is understood as representing an idea, object, or relationship. Symbols allow people to go beyond what is known or seen by creating linkages between otherwise very different concepts and experiences. All communication (and data processing) is achieved through the use of symbols.Symbols take the form of words, sounds, gestures, ideas or visual images and are used to convey other ideas and beliefs. For example, a red octagon may be a symbol for "STOP". On a map, a blue line might represent a river. Numerals are symbols for numbers. Alphabetic letters may be symbols for sounds. Personal names are symbols representing individuals. A red rose may symbolize love and compassion. The variable 'x', in a mathematical equation, may symbolize the position of a particle in space. - This is a list of units that are not defined as part of the International System of Units ( SI ) , but are otherwise mentioned in the SI , because either the General Conference on Weights and Measures ( CGPM ) accepts their use as being multiples or submultiples of SI - units , they have important contemporary application worldwide , or are otherwise commonly encountered worldwide . - The International System of Units (; abbreviated as SI) is the modern form of the metric system, and is the most widely used system of measurement. It comprises a coherent system of units of measurement built on seven base units. The system also establishes a set of twenty prefixes to the unit names and unit symbols that may be used when specifying multiples and fractions of the units. - A system of measurement is a collection of units of measurement and rules relating them to each other. Systems of measurement have historically been important, regulated and defined for the purposes of science and commerce. Systems of measurement in modern use include the metric system, the imperial system, and United States customary units. - The International Bureau of Weights and Measures, is an international standards organisation, one of three such organisations established to maintain the International System of Units (SI) under the terms of the Metre Convention ("Convention du Metre"). The organisation is usually referred to by its French initialism, BIPM. - Metre Convention, also known as the Treaty of the Metre, is an international treaty that was signed in Paris on 20 May 1875 by representatives of 17 nations. The treaty set up an institute for the purpose of coordinating international metrology and for coordinating the development of the metric system. The treaty also set up associated organizations to oversee the running of the institute. Initially it was only concerned with the units of mass and length but, in 1921, at the 6th meeting of the General Conference on Weights and Measures (CGPM), it was revised and its mandate extended to cover all physical measurements. In 1960, at the 11th meetings of the CGPM, the system of units it had established was overhauled and relaunched as the "International System of Units" (SI). - The General Conference on Weights and Measures ( CGPM) is the senior of the three Inter-governmental organizations established in 1875 under the terms of the Metre Convention to represent the interests of member states. The treaty, which also set up two further bodies, the International Committee for Weights and Measures ( CIPM) and the International Bureau of Weights and Measures ( BIPM), was drawn up to coordinate international metrology and to coordinate the development of the metric system. Given the information, choose the subject and object entities that have the relation of 'subclass of'.
Answer:
non-si units mentioned in the si , unit of measurement