Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. ETAOIN SHRDLU is a nonsense phrase that sometimes appeared in print in the days of "hot type" publishing due to a custom of Linotype machine operators. It is the approximate order of frequency of the twelve most commonly used letters in the English language. The letters on Linotype keyboards were arranged by letter frequency, so ETAOIN SHRDLU were the first two vertical columns on the left side of the keyboard. Linotype operators who had made a typing error could not easily go back to delete it, and had to finish the line before they could eject the slug and re-key a new one. Since the line with the error would be discarded and hence its contents did not matter, the quickest way to finish the line was to run a finger down the keys, creating this nonsense phrase.

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