Both Uses

Morse code
in
The Power and the Glory, by Graham Greene by Greene
(Auto-generated)

If you come again I shall teach you the Morse code.†
Chpt 1.3 *
He stood just inside the door trying to remember what the child had told him — the Morse code, her window: across the dead-white dusty yard the mosquito wire caught the sun.†
Chpt 2.4

Definitions:

(1) (Morse code)
a code in which letters and numbers are represented by strings of short and long signals such as dots and dashes

Originally used for telegraph messages and still in specialized uses today where a non-computer assisted code is desired. Perhaps the most innovative use of Morse code is when an American prisoner in the Vietnam War was forced to give a delayed-broadcast television interview. Unknown to his captors, while talking, he blinked his eyes in Morse code to spell out the word "T-O-R-T-U-R-E" and other messages.
(2) (meaning too rare to warrant focus)