FOW /fɑʊ/ (using a common phonetic transcription system, the International Phonetic Alphabet or IPA)

This represents the pronunciation as:

• f as in "father"
• ɑʊ as in "cow"

Alternative phonetic spellings, depending on dialectal variations or desired level of detail, might include:

• /fəʊ/ (with a schwa sound instead of a broad "ah")
• /faʊ/ (a simpler representation omitting the subtle differences in vowel sounds)

The exact phonetic spelling can vary slightly depending on the specific pronunciation and the phonetic system used. The above options provide a range of possibilities.