This term is used by companies that offer subscription services to clients for example, telephone carriers, Internet service providers, and hosts. It is a measure of the revenue generated by one customer phone, pager, etc., per unit time, typically per year or month.
filch. vb. 1. (tr) to steal or take surreptitiously in small amounts; pilfer. [C16 filchen to steal, attack, perhaps from Old English gefylce band of men].
Another example of a flat character could be seen in the film Harry Potter and the Sorcerer's Stone in the character of Filch. Filch is obsessed with catching students and with his cat. The readers do not learn anything else about Filch so he remains a one-dimensional or flat character.