'Wheel' in the Bible

Now as I looked at the living beings, I saw one wheel on the ground beside the living beings, for each of the four of them.

Regarding the appearance of the wheels and their construction: they gleamed like chrysolite (beryl, olivine); and the four were made alike. Their appearance and construction were a wheel [set at a right angle] within a wheel.

It came about when He commanded the man clothed in linen, saying, “Take fire from between the whirling wheels, from between the cherubim,” the man entered and stood beside a wheel.

Then I looked and behold, [there were] four wheels beside the cherubim, one wheel beside one cherub and another wheel beside each other cherub; and the appearance of the wheels was like a sparkling Tarshish stone (beryl).

As for their appearance, all four looked alike, as if one wheel were within another wheel.

When they moved, they went in any of their four directions without turning as they went; but they followed in the direction which they faced, without turning as they went.