Does anybody know what this symbol presents? 
Answer
Figure 1. Tri-state buffers with opposite control logic. Image source.
It's a combination or overlay of the two symbols in Figure 1. Rotate the symbol on the right by 180° and overlay on the symbol on the left.
Figure 2. Borrowing the symbol from KingDuken's answer but changing the infill to show the two buffers.
If the control signal is high the gate transmits from left to right. If the control signal is low the gate transmits from right to left.
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