| Subject | English | Italian |
| fin. | operating unit | unita operativa |
| comp., MS | operating unit | unità operativa (An organization that divides the control of economic resources and operational processes among people who have a duty to maximize the use of scarce resources, to improve processes, and to account for their performance) |
| commun. | operating unit for automation of composing machines | unità operatrice per l'automazione delle compositrici |
| mater.sc. | unit operating duty period | periodo di funzionamento sotto sforzo di un equipaggiamento |