In a gyro, an axis through the center of gravity and perpendicular to the spin axis. The vertical axis on a chart.

the vertical axis in a plane coordinate system

The vertical axis of the rectangular coordinate system.

The vertical (up-and-down) axis of a line or image.

The vertical axis of a graph.

An imaginary line perpendicular to the x-axis and fixation axis through the center of rotation. A line perpendicular to the x-axis of the spectacle lens and optical axis.

The vertical line on a graph or chart, usually containing the values for data points.

The vertical reference line in the Coordinate Plane.

The intermediate spin axis on a ball. Located 63/4" from the X and Z axis.

The ordinate or vertical axis in a cartesian plane

Mathematical Vertical Axis.

The lateral axis around which a vehicle pitches fore and aft.

the vertical number line.

One of the axes in a three-dimensional system, that is not the x- or y-axis.

Conventionally, the axis perpendicular to and in the horizontal plane through the x-axis of any type of graph.

In composite laminates, the axis in the plane of the laminate that is perpendicular to the x-axis. Contrast with x-axis.