also: ブイアイ
noun
Refers to the classic Unix text editor vi. Used in computing contexts.
サーバー設定はVIで編集します。
I edit server settings with vi.
noun
viscosity index
Technical term for a measure of a lubricant's viscosity change with temperature. Rare outside engineering contexts.
この潤滑油は粘度指数(VI)が高い。
This lubricant has a high viscosity index (VI).