Plug 'n Power: One of two code dials on a receiver ( module). There are sixteen unit codes available, 1 - 16 When the corresponding number switch on a transmitter ( controller) is pressed, any modules set to the same unit code will respond.

a number (1-16) setting on an X-10 device, combined with a House Code to uniquely identify the X-10 device.

the code given to a particular unit. It has the format XXX999. The first two characters indicate the faculty or school administering the unit. The third character indicates the level of the course in which the unit is normally taught.

An individual code has been allotted to each unit of study. The code is three or four letters to represent the subject area followed by one digit to represent the level of the unit: 1 = 100 level, 2 = 200 level, 3 = 300 level etc followed by two further digits to distinguish the particular unit. For example, the unit code for Medicinal Chemistry is CHEM342, indicating that it is a Chemistry unit and 300 level.

A three-digit code used to identify a part of an organization. Each Caltrans district is divided into units or cost centers.