Meaning of Greek letter | Babel Free

Definitions

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

Examples

“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.”

CEFR level