According to The New Partridge Dictionary of Slang and Unconventional English, this example of a calculator spelling trick is the earliest known one, it dates back to the 1970s.
But of course the “creator” of the term can’t be determined, it only can be assumed that it happened like a happy accident.
This has been a fun little game during boring math class throughout decades amongst children.
There are also other sequences that can spell out different kinds of words, such as 07734, which reads “Hello”, “shell” with 77345 or for example with 378806 you can spell out the word “gooble” by turning it upside down on the calculator.
In different languages, such as Italian, Portuguese or French and many more. There are words that can be spelled out with number sequences.This has been a fun little game during boring math class throughout decades amongst children.