Cloud9, without a space between "cloud" and "9":

• Cloud9, a professional esports organization based in California that sponsor teams that compete in several games
• Cloud9 Technologies, a voice turret phone system used by financial traders
• Cloud9 (service provider), a mobile phone company in the Isle of Man
• Cloud9 IDE, an open source cloud web-based integrated development environment
• Cloud9, a fictional big-box store in Superstore (TV series)

• Cloud Nine (disambiguation)