The letter 'W' (called 'uve doble' or 'doble u') stands out from the rest of the letters in the Spanish alphabet. This is because there are no native Spanish or Latin (where Spanish derives from) words that use the letter 'W'.
Spanish Marks Blog
Learning how to read and write Spanish can only get you so far, because if you don’t know how to pronounce your pero from your perro, you may get into many sticky situations! The good news is that Spanish is a phonetic language, which means that you can look at almost any word and immediately know how to pronounce it.