U (named u /ˈjuː/, plural ues) is the 21st letter and the fifth vowel in the ISO basic Latin alphabet. == History == The letter u ultimately comes from the Phoenician letter Waw by way of the letter y. See the letter y for details. During the late Middle Ages, two forms of 'v' developed, which were both used for its ancestor 'u' and modern 'v'. The pointed form 'v' was written at the beginning of a word, while a rounded form 'u' was used in the middle or end, regardless of sound. So whereas 'valour' and 'excuse' appeared as in modern printing, 'have' and 'upon' were printed 'haue' and 'vpon'. The...