Original text on this page prior to its migration to StructuredDiscussions:
Why is it called Hor+? The abbreviation for horizontal is usually horiz, like on old tv dials.
--SirYodaJedi (talk) 22:26, 22 January 2019 (CET)
Because that's the term WSGF opted to use in the early 2000s, and have since then become the standard term used among the vast majority of PC gamers.