Escrima, Kali and Arnis are 3 different words for the same art. It really depends on the person teaching the style and what they refer to it as. In different regions and time periods of the Philippines, they had different names for martial arts. At one time or another many of the masters of the Filipino martial arts trained and sparred with one another and traded techniques. The training methods used to develop skill sets are extremely similar across most of the different variations of the Filipino martial arts. Every Guru or master teaching escrima will teach a little differently. Which is just like saying that every boxing coach has their own way of developing boxers.