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International Classification of Goods and Services also known as the Nice Classification was established by the Nice Agreement (1957), [1] is a system of classifying goods and services for the purpose of registering trademarks. It is updated every five years and its latest 11th [2] version of the system groups products into 45 classes (classes ...
List of chemical elements. 118 chemical elements have been identified and named officially by IUPAC. A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z ). [1]
A mnemonic is a memory aid used to improve long-term memory and make the process of consolidation easier. Many chemistry aspects, rules, names of compounds, sequences of elements, their reactivity, etc., can be easily and efficiently memorized with the help of mnemonics.
A three-letter temporary symbol may be assigned to a newly synthesized (or not yet synthesized) element. For example, "Uno" was the temporary symbol for hassium (element 108) which had the temporary name of unniloctium, based on the digits of its atomic number. There are also some historical symbols that are no longer officially used.
As you've already noted, Apple's "k" prefix indicates constants. Typically, the k prefix is followed by type, followed by a more general indication of the item's use. A typical Apple symbol, such ...
Where ever there is a Q there is a U too (But this is violated by some words; see:List of English words containing Q not followed by U) Letters of specific syllables in a word. BELIEVE; Do not believe a lie. SECRETARY; A secretary must keep a secret. TEACHER; There is an ache in every teacher. MEASUREMENT
1 Control-C has typically been used as a "break" or "interrupt" key. 2 Control-D has been used to signal "end of file" for text typed in at the terminal on Unix / Linux systems. Windows, DOS, and older minicomputers used Control-Z for this purpose. 3 Control-G is an artifact of the days when teletypes were in use.
Many star names are, in origin, descriptive of the part in the constellation they are found in; thus Phecda, a corruption of Arabic فخذ الدب ( fakhdh ad-dubb, 'thigh of the bear'). Only a handful of the brightest stars have individual proper names not depending on their asterism; so Sirius ('the scorcher'), Antares ('rival of Ares ', i.e ...