This is a term that describes the number of times the wires are wrapped around the armature web of the motor. The less turns a motor has, the faster it will go, and vice versa (so a 13T motor will run way faster than a 20T motor).
Motors with very few turns can consume battery power quickly and can also generate massive heat, therefore both your ESC and your battery (and the wires they use) must be strong enough to sustain the heavy load. In fact most modern ESCs are marketed with a rating specifying the “minimum number of turns” that can be sustained.
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