Mach was a unit of measure to describe high speeds within an atmosphere. Mach 1 was equal to the speed of sound.

When the mining shuttle Nenebek passed through the atmosphere of Lambda Paz in preparation for a crash-landing in 2367, the crew had to manually trip the bypass from the main engine to the thrusters to maintain a controlled entry, which was performed when the shuttle had slowed to below Mach 1. (TNG: "Final Mission")

When the orbital tether used to escape a Nezu colony in 2373 had reached the upper troposphere, it was traveling at a velocity of Mach 2.1. (VOY: "Rise")

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