X4, X-4 or x4 may refer to: * BMW X4, a German crossover automobile * Sehol X4, a Chinese crossover automobile * Honda X4, a Japanese motorcycle * Moto X4, an Android Smartphone * '' Mega Man X4'', a video game * Naish X4, a kitesurfing kite * The Norteños street gang * Northrop X-4 Bantam, an early jet age research aircraft * A common name for

petroleum ether Petroleum ether is the petroleum fraction consisting of aliphatic hydrocarbons and boiling in the range 35–60 °C, and commonly used as a laboratory solvent. Despite the name, petroleum ether is not an ether; the term is used only figurativ ...

* A four-lane

PCI Express PCI Express (Peripheral Component Interconnect Express), officially abbreviated as PCIe, is a high-speed standard used to connect hardware components inside computers. It is designed to replace older expansion bus standards such as Peripher ...

slot *

Ruhrstahl X-4 The Ruhrstahl Ru 344 X-4 or Ruhrstahl-Kramer RK 344 was a Wire-guided missile, wire-guided air-to-air missile designed by Germany during World War II. The X-4 did not see operational service and thus was not proven in combat but inspired conside ...

, a German World War II air-to-air guided missile * Ultimate X4, a comic-book crossover in the Ultimate Marvel Universe * X4 (New York City bus), an express bus route * Stagecoach Gold bus route X4, a bus route in the United Kingdom * X4 virus, a T-cell tropic HIV * '' X-Men Origins: Wolverine'', a 2009 film * '' X-Men: Days of Future Past'', a 2014 film *

WordPerfect WordPerfect (WP) is a word processing application, now owned by Alludo, with a long history on multiple personal computer platforms. At the height of its popularity in the 1980s and early 1990s, it was the market leader of word processors, disp ...

X4, a version of word processing software * '' X4: Foundations'', a 2018 video game

See also