two-letter matrix
121Braille — /brayl/, n., v., Brailled, Brailling. n. 1. Louis /looh is, looh ee/; Fr. /lwee/, 1809 52, French teacher of the blind. 2. a system of writing or printing, devised by L. Braille for use by the blind, in which combinations of tangible dots or… …
122GENIZAH, CAIRO — Introduction The term genizah is a word shortened from the rabbinical Hebrew phrase bet genizah (see also genizah ). Its counterpart in late biblical Hebrew is genez (pl. genazim, ginzei) which in Esther evidently means a treasury, as well as the …
123JERUSALEM — The entry is arranged according to the following outline: history name protohistory the bronze age david and first temple period second temple period the roman period byzantine jerusalem arab period crusader period mamluk period …
124Atomic orbital — The shapes of the first five atomic orbitals: 1s, 2s, 2px, 2py, and 2pz. The colors show the wave function phase. These are graphs of ψ(x,y,z) functions which depend on the coordinates of one electron. To see the elongated shape of ψ(x,y,z)2… …
125Graph theory — In mathematics and computer science, graph theory is the study of graphs : mathematical structures used to model pairwise relations between objects from a certain collection. A graph in this context refers to a collection of vertices or nodes and …
126Variance — In probability theory and statistics, the variance of a random variable, probability distribution, or sample is one measure of statistical dispersion, averaging the squared distance of its possible values from the expected value (mean). Whereas… …
127Vitamin K — has also been used as a slang term for ketamine, an unrelated anaesthetic. Vitamin K1 (phylloquinone). Both forms of the vitamin contain a functional naphthoquinone ring and an aliphatic side chain. Phylloquinone has a phytyl side chain …
128Pinball — covered case called a pinball machine. The primary objective of the game is to score as many points as possible. Secondary objectives are to maximize the time spent playing (by earning extra balls and keeping the ball in play as long as possible) …
