The letter “W” is called “double U” because the Normans invented it by combining two pointed capital letters to represent the sound “w” in Anglo-Saxon words after the Norman Conquest of England in 1066. The name “double U” still indicates how the letter was created.

Before the Norman Conquest, the Latin letter “V” was used to represent both the “v” and “w” sounds. The Anglo-Saxons created a separate character called “wen” to represent the “w” sound. After the Norman Conquest, the Normans combined two pointed capital letters to create the “W” to represent the “w” sound in Anglo-Saxon words.

In early Middle English, the digraph “uu” became popular again and replaced “wynn” in common use by 130