Today motion sensing has progressed to being three-axes of acceleration, and three axis of rotation (technically called gyroscopes).

FORBES: Exponential Growth in Small Machines - Don't Fear, They're Here to Protect You

By the end of 1942 America's output of war materiel already exceeded the combined production of the three Axis powers, Germany, Italy and Japan.

ECONOMIST: The "dollar-a-year" men and what they achieved

By combining its three axis gyroscope with its three axis accelerometer, the newest iPhone is expected to reach a new level of sensitivity for apps.

FORBES: Riding iPhone 4 Using ETFs

Everything from the 120MHz Cortex-M3 MCU to the three-axis accelerometer and the Bluetooth radio was on a single board.

ENGADGET

The photovoltaic system consists of three single-axis tracking units mounted to the ground.

FORBES: Borrego Solar Systems Completes Its Largest PV Installation At A Federal Site

Yet the painter is skillful in depicting their clothing, and three trees that form the central axis in both works have a majesty that makes you wish they were not so incidental to the composition.

WSJ: Johan Zoffany | Yale Center for British Art | On the Strenth of His Portraits | By Tom L. Freudenheim

The probe was built with four reaction wheels and needs three of them -- one for each axis -- to aim its telescope precisely at a distant star, deputy project manager Charlie Sobeck said.

CNN: Planet-hunting Kepler spacecraft in trouble

The number of licenses issued for export of five-axis machine tools to China dropped from nine in 2006 to only three in 2007.

FORBES: Is Foxconn Fleeing China? Sure Looks Like It.