In British English, the phonetic symbol /aʊ/ corresponds to the vowel sound in words like "how" and "out". It is called a diphthong.
Some common words which practice the pronunciation of /aʊ/ include the following:
- with "ou": doubt - count - found - loud - out - shout - sound;
- with "ow": brown - cow - down - how - now - owl - towel - tower - town;