CH4 most commonly refers to the chemical formula for methane. CH4 may also denote: a postcode subdistrict of Chester, United Kingdom the CH-4 variant of the Cessna CH-1 Skyhook helicopter the CH-4 variant of the CASC Rainbow unmanned aerial vehicle CH-4, a submarine chaser during World War II Channel 4 (disambiguation) Church Hymnary 4th edition Chandrayaan-4 (CH-4), Moon lander This disambiguation page lists articles associated with the same title formed as a letter–number combination.If an internal link led you here, you may wish to change the link to point directly to the intended article. Wikiwand - on Seamless Wikipedia browsing. On steroids.