X1

X1 may refer to:

Bell X-1, the first aircraft to exceed the speed of sound.
X-1 Submarine, the United States Navy's only midget submarine.
HMS A1, a Royal Navy submarine.
HM Submarine X1, a Royal Navy submarine.
X1 (X Prize spaceflight), the second Ansari X Prize flight.
X1 Desktop Search, a search program for Microsoft Windows.
Sharp X1 series of personal computers.
Electrologica X1, an early Dutch computer.
X1 Train, a commuter train.
Cygnus X-1 or Scorpius X-1, astronomical x-ray sources.
X-Men, the film based on the comic characters, the X-Men.
Mega Man X1, the first video game in Capcom's series of Mega Man X games
X-1 (Rapper), brother of hardcore Rapper Sticky Fingaz

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