To solve the problem, you said that in mathematics, k is the abbreviation of "kilo" (kilogram also refers to quantity). 1k=1000. m is the abbreviation of "million (million). 1m=1000k=1000000. If you are talking about data traffic, 1k=1024b, 1m=1024kb. The practice of "local variables starting with m_" in the question is rarely seen in real life, because everything starting with m_ is basically a member variable :) (member variable => member variable => m_). Except for various reserved names (you can't use . Guo Dunyong answered: k and m are the kilo and trillion respectively used to form the prefix of decimal multiples (and fractions) in the national legal units of measurement, k=1000=10^3, thousand; m=10^6, trillion (million, 1000²). m stands for meter in the unit of length, .
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In academic documents, the letters [j], [m], and [z] represent different document types respectively. [j] stands for journal article, meaning the article is published in a journal. [m] represents a monograph, that is, a book. [z] indicates other unspecified document types, this. Although Newton-meter (n·m) and Newton/meter (n/m) are both common units in physics, the physical quantities they represent and their uses are different. First, the Newton meter (n·m) is the unit of torque, which is the product of force and moment arm and is a measure of the rotation of an object.
