Reverse Tab ⇤ is still with us, above the Tab ⇥ symbol. It is at the top to indicate that it is generated while holding Shift.

Many people have got the misconception that both symbols together is the Tab symbol, though. There is even a symbol consisting of both close together in Unicode: ⭾ and many PC keyboards that similarly have both arrows closer together than on keys with printed symbols generated with and without holding Shift. (Apple has been printing only ⇥ though)