The quick brown fox jumps over the lazy dog" is a 35-letter pangram (a phrase that uses all the letters of the alphabet) that has been used to test typewriters and computer keyboards because it is nicely coherent and short. It was known in the late 19th century, and used in Baden-Powel's book Scouting for Boys (1908) as a practice sentence for signaling. In later years, the phrase was popularized by Western Union and the Telephone Company to test Telex/TWX data communication equipment for accuracy and reliability. It was often used for testing the teletype services (a procedure known as "foxing") when these machines were still used. In the age of computers, it is often used as a sample text in font selection contexts