Independent Software Vendors

Independant Software Vendor. A somewhat historic term, but still frequently used today. In the early days of computing most software was written by hardware manufacturers for their own hardware and was referred to as "proprietary". Independant Software Vendors produce software which runs on other companies hardware and generally have no involvement in the manufacture of hardware.

A software producer that is limited to producing applications for a single hardware manufacturer, e.g. Microsoft.

In situ vitrification

in-situ volatilization

Sludge Volume Index; Volume in ml occupied by 1 gram of activated sludge after settlement under specified conditions for a specified time, usually 30 minutes.

(instantaneous speed variation) the fluctuation of speed of recording tape over extremely short periods of time