Greek letter

1. USalternativenot comparableAlternative spelling of Greek-letter.

   The following national Greek letter fraternities and sororities, served officially by this Company, were listed in our 1927 Blue Book...

   1928, Balfour Blue Book, page 2

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   Each Friday we held open house at the Young Women's Christian association for all Greek letter women who could come (if but for an hour) to sew for the French orphans.

   1918, Kappa Alpha Theta, volume 33, page 358

   Other Greek letter house fires of importance here include the burning of the Pi Kappa Alpha house in the Christmas holidays of 1924 and the burning of the roof and second floor of the Delta Zeta house in the Spring of 1926.

   1934, Kappa Sigma Fraternity, Caduceus, page 500

plural Greek letters

1. Used other than figuratively or idiomatically: see Greek, letter. A letter of the Greek alphabet.

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   Alternatively, they clear when the line is unoccupied to the next signal and when an approaching train occupies a short, normally de-energised, track circuit on the approach side of any of the signals. These normally de-energised track circuits are labelled with a Greek letter to emphasise their difference from the normal track circuits, and are short enough to ensure an adequate restriction of speed being imposed on the train.

   1952 September, Norman Crump, “Camden Town Signalbox, London Transport”, in Railway Magazine, page 585