“…The sensor-based approach uses some sensors and devices in order to get the captured motion, position and velocity, from the literature we can summarize the used sensors as [20]: (a) (IMU) Inertial measurement unit which is used for recording the body position and velocity, (b) Electromyography (EMG) it is electrodiagnostic medicine device which is used for measuring and recording the human muscle's pulse in order to detect the body parts activity, (c) Radar and Wi-Fi, it uses the radio frequency signals in order to detect the human activities and body motion, (d) Other approaches depending on data gloves which are fabricated from flex sensors or including electromagnetics or ultrasonic techniques, the using of gloves is the common and popular used approach in sensor-based approach. For non-Arabic systems, Raut proposed a recognition system for 10 isolated signs using sensor-based approach, the gloves were designed from flex sensors and accelemeter [21]. Rajamohan uses data gloves which were fabricated from 5 flex sensors and one accelerometer added to some tactile sensors, they were used to recognize 13 static American alphabets, the accuracy reached 90% [22].…”