Why did the International Telecommunication Union abbreviate "Coordinated Universal Time" to "UTC"?

Question

Which city houses the headquarters of the Universal Postal Union (UPU), an international organisation that coordinates the world-wide postal system ?

Answer 1

The International Telecommunication Union wanted Coordinated Universal Time to have a single abbreviation in all languages.
English speakers and French speakers each wanted the initials of their respective language's terms to be used internationally:
"CUT" for "coordinated universal time" and "TUC" for "temps universel coordonné".
This resulted in the final compromise of using "UTC", which suits no-one.