// Workers AI · dad joke modeWhat did X4 say to X3? You're one less than me.

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
• A four-lane PCI Express slot
• Ruhrstahl X-4, 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 X4, a version of word processing software
• X4: Foundations, a 2018 video game
• The airline code for SeaPort Airlines

See also

• 4X (disambiguation)