On jet aircraft it displays the vertical speed in thousands of feet per minute, usually in the range -6 to +6.

The aircraft landed with a vertical speed exceeding the manufacturer's design limits.

The ratio of the horizontal speed versus the vertical speed gives the same answer.

The rocket begins by flying straight up, gaining both vertical speed and altitude.

The average vertical speed in a landing is around 2 metres per second.

To your left; the rate of climb gauge that tells us our vertical speed up or down.

It's harder than it might seem to stabilize the vertical speed because the airspeed also constantly changes.

The aircraft crashed on its third landing attempt in severe weather with a high vertical speed.

It measures airspeed, altitude, vertical speed, and outside air temperature.