The rock band "An Horse" is a great example of the unconventional ways that words can be spelled. The name of the band is phonetically pronounced as /æn hɔrs/, with the first word being "an" instead of "a". The reason behind this is to ensure that the pronunciation of the band's name is always correct, no matter where in the world it is being pronounced. The slight difference in spelling makes a big impact on the pronunciation, giving the band a unique and memorable name.
The word "an horse" is an archaic form of "a horse" and has its origins in Old English. In early medieval English, the article "an" was used before words beginning with a vowel sound, while "a" was used before words beginning with a consonant sound. Over time, the pronunciation of the "h" in "horse" changed from being silent to a voiced sound, and thus the article "an" fell out of use in this context. The modern form "a horse" gradually replaced "an horse" in usage, but the archaic form is sometimes still encountered in older literature.