The digraphwh is used to express a phoneme: Note: This page contains IPA phonetic symbols in Unicode. ... In human language, a phoneme is a set of phones (speech sounds or sign elements) that are cognitively equivalent. ...
In the English language, [ʍ] (voiceless labial-velar fricative) the continuation of the PIElabiovelar (formerly spelled hw, see hwair). Notably interrogative words begin with this phoneme, whence they are also known as wh-words. The phoneme is lost in most varieties of English, see wine-whine merger.
In the Māori language, it represents the /f/ or /ɸ/ phoneme, but some North Shore tribes will pronounce it as /h/ or /hw/. When Europeans arrived in New Zealand, it was the North Shore accent that they heard first. They used "Wh" to spell the sound, however later it was found that different iwi pronounce this sound in different ways.
It is an abbreviation for the Wardlaw-Hartridge School in Edison, New Jersey. Common variants include W-H and WHS.