Φ
also: フィー
ファ
イ
Meanings
1
phi
The Greek letter Φ/φ, used in mathematics, physics, and engineering. Both ファイ and フィー readings are used, with ファイ being more common.
In mathematics, Φ often represents the golden ratio.
In physics, φ is used as a symbol for magnetic flux.
Usage patterns
- Φ〈数〉diameter of ~ (used before a number to indicate the diameter of a round object, esp. in technical drawings)
This pipe has a diameter of 10mm.
- 〈事〉をΦで表すto represent something with the symbol Φ (in a formula or equation)
In this equation, the angle is represented by Φ.