A "low squat" is a position where you sit with your feet flat on the ground and your bottom close to the floor, like sitting in an imaginary chair. Full definition
In a slightly lowered squat position, jump as far to your left as you can and land on your left foot. (womenshealthandfitness.com.au)
From that wide low squat position, hop your feet together into a narrow squat and then back out wide (staying low in your squat the whole time). (pumpsandiron.com)
For example with the exercise low squats, lower yourself down for 3 seconds, hold yourself there for 2 seconds and then raise yourself up in 3 seconds again. (8fit.com)