The Shümom language is an artificial language created by Sultan Ibrahim Njoya. It was developed as a secret language for the use of palace officials, employing a random mix of words from French, English, and German. Each word was assigned a new meaning to create a secret code.
Shümom can be written in the Bamum or Shüpamom script.
References
Further reading
"Provisional notes on cataloging in the A-ka-u-ku (Bamum) script, in the Shümom and Bamum languages | Yale University Library". web.library.yale.edu.