What knowledge do you not know?

W is read from V. W is double V, which should be read as double V. The reason why W is read as double U is because U and V have been indistinguishable for centuries before the 19th century, and are interchangeable. V is both a symbol of V and U, even if it is U, it is often a V, such as upon often spelled vpon. French letters are read like double V /dublə ve/