Sur le Cou-de-pied means "on the neck of the foot" in French. This pirouette starts with one foot resting between the ankle and base of the calf. That foot is then raised to turn inward toward the supporting leg for the spin. In all pirouettes the body is completely centered over the supporting leg. The back is erect and hips and shoulders are aligned.
En attitude is a ballet position derived by Carlo Blasis from a statue of Mercury by Giovanni da Bologna, according to the American Ballet Theatre. One leg is lifted behind the dancer, while the other leg is supporting the body. The lifted leg is bent at a 90 degree angle. One arm is curved above the head, while the other arm is extended to the side. A pirouette from this position would start with the leg lifted behind and then the spin would take place with the lifted leg over the supporting leg.
En arabesque is when the dancer has one leg extended behind with the other leg supporting at a right angle to the floor. The supporting leg can be straight or in a demi-plie, which is when the knee is half bent. The arms are in front and behind the body in right angles to the supporting standing leg. A pirouette from this position would be formed as the extended leg spins with the other leg supporting.
A la seconde is the second position, which is where the feet are one foot apart with the balls of the feet completely turned out. The pirouette a la second is usually danced by male dancers. The dancer spins with the supporting leg in this turned out position and it is a move that uses great strength.