His Master's Voice, usually abbreviated to HMV, is a famous trademark in the music business, and for many years was the name of a large record label. The name was coined in 1899 as the title of a painting of the dog Nipper listening to a wind-up gramophone. Their retail stores are currently the #1 high street music retailer in the UK (excluding supermarkets), but has competition across the UK with Virgin Megastores and more recently Internet retailers of physical product.

is that value of H corresponding to the recoil induction, B,; measured in oersteds.