The Alphabet
Unravelling the mystery of the alphabet
from A to Z (letter by letter)
by David Sacks
'The best book I've ever read'
For instance, in the chapter on X, this interesting info (on page 344)...
"Why isn’t Z the unknown?
According to legend, a 17th-century printer’s problem helped X land its major job symbolising something unknown. For the many equations in his now-famous 1937 mathematical work La Géométie, René Descartes chose letters A, B and C to represent any three constants and X, Y and Z to to represent any three unknowns. He intended that Z be the first unknown (corresponding to A) with Y second and X third.
But the story goes that the printer, while typesetting the manuscript, found himself repeatedly running short of letter blocks for Y and Z, due to Descartes’ many equations calling for these letters. However, the printer still had plenty of Xs, a letter that in French-language print is used far less than Y or Z.
So the printer wrote to Descartes, asking whether it made any difference which of the three, Z, Y or X, appeared in equations of one or two unknowns and might X be the preferred letter for printing purposes?
The great man replied that it was acceptable. And that is why the Géométie tends to favour X as the letter of an unknown quantity, especially in the second half of the treatise."
Published by Arrow Books 2004
ISBN
0 09 943682 5