Jab Elbow Smash, called Straight+Elbow (ストレート + エルボー/Sutoreeto + Eruboo) in Japan, is an attack used by the Jack series of androids, Ganryu, Kuma I, Kuma II and Panda since the first Tekken game.
The original input in the first game was 2,1 and only consisted of two hits (hence the Japanese name being Straight+Elbow). In Tekken 2, the string was extended to 2,1,2, with the third hit being a small uppercut which offers a weak launch. The uppercut leaves the user in a crouch position. An alternate version with different damage can be performed with f+2,1, with the string being extended to f+2,1,2 in Tekken 4.
The 2,1,2 variation cannot be performed by Ganryu as his right punch was replaced with his right-handed Open Palm Combo in Tekken 2, which had previously been mapped to f+2. While Ganryu can perform both versions of the move in the original Tekken, he can only perform the alternate version by inputting f,f+2,1 or while walking forward for 2 steps (20 frames). As of Tekken 5, Ganryu can no longer perform any version of this move.
In Tekken 5, Kuma's animation became different to Jack, however the input and damage is the same.