An acronym for Open RAN, but the hyphenated form

is mostly used to denote the O-RAN Alliance specifically, which  was established in 2018 by a global consortium of network  operators with the goal of promoting Open RAN standards

and driving its adoption. O-RAN is also used when referring to  standards defined by the alliance, such as in O-RAN 7-2x, which  indicates the open fronthaul standard for Split Option 7-2x.