W
ダブル
Perhaps you were looking for the article about the show Kamen Rider W?
Definition: Double
The Japanese use W as a shorthand for "Double" since they're pronounced the same in Japanese (daburu).
Examples
Kamen Rider W is a famous example where the letter W also represents the theme of show, the two detectives becoming a single Kamen Rider. There's also W incorporated into his Rider design. The show logo is written as Kamen Rider W in Japanese, but the English subtitle writes it Kamen Rider Double.