The Vietnamese alphabet (c"hữ Quốc ngữ" in Vietnamese) is a version of the Latin alphabet used to write the Vietnamese language. It uses the all the letters of the ISO Basic Latin Alphabet expect for F, J, W, and Z (which are only found in loanwords). However, the alphabet has been changed heavily in order to accurately show Vietnamese pronunciation. Some letters and digraphs make very different sounds than what most readers of the Latin alphabet expect, such as D, R, and GI. One letter has been added, Đ, to show it is a completely different sound from D. Vowel markers are added in order to distinguish different vowels sounds like A, Â, and Ǎ. Tone markers are also added because Vietnamese is a tonal language, like Á, Ả, Ã, Ạ and À. Some vowels have both a vowel marker and a tone marker. For example, the vowel Ǎ can be written as Ắ, Ẳ, Ẵ, Ặ, and Ằ. Sometimes, even non-speakers of Vietnamese can tell something is written in Vietnamese because of how many markings a word can have.