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The z read-only property of the Gyroscope interface returns a number specifying the angular velocity of the device along its z-axis.
A Number.
The gyroscope is typically read in the reading event callback. In the example below this occurs sixty times a second.
let gyroscope = new Gyroscope({ frequency: 60 });
gyroscope.addEventListener("reading", (e) => {
console.log(`Angular velocity along the X-axis ${gyroscope.x}`);
console.log(`Angular velocity along the Y-axis ${gyroscope.y}`);
console.log(`Angular velocity along the Z-axis ${gyroscope.z}`);
});
gyroscope.start();