Scrabble rotating mechanisms and personalized graphics. An edition has been released (in association with the RNIB) with larger board and letters for players with impaired vision. The colours on the board are more contrasting and the font size is increased from 16 to 24 point. The tiles are in bold 48 point. An introduction to tournament "Scrabble" and its players can be found in the book "Word Freak" by Stefan Fatsis. In the process of writing, Fatsis himself progressed into a high-rated tournament player. The "Scrabble Player's Handbook", edited by Stewart Holden and written by an international group of tournament players,
Square (algebra) composition algebras. The complex square function is a twofold cover of the complex plane, such that each non-zero complex number has exactly two square roots. This map is related to parabolic coordinates. Squares are ubiquitous in algebra, more generally, in almost every branch of mathematics, and also in physics where many units are defined using squares and inverse squares: see below. Least squares is the standard method used with overdetermined systems. Squaring is used in statistics and probability theory in determining the standard deviation of a set of values, or a random variable. The deviation of each value from the