I'm studying DRams and SRams at university and on the slides the lines where a data is read or written is called DQ. But whats does it means? Maybe
D is for Data, but Q?
I think that the origin of the name comes from the convention for flip flops. On a D flipflop the data in pin is generally called D, and the data out pin, Q. Since the memories data bus is bidirectional, a data pin can be D when it is input or Q when it is output hence the name DQ.
I quote from this IBM article - https://www.ece.cmu.edu/~ece548/localcpy/sramop.pdf
The DQ pins are used for data input and output. DQs on SRAMs come in two forms — on some devices, the inputs and outputs are separate, on others, they are common, with the input and output using the same pin on the memory device. All of IBM Microelectron- ics' SRAM offerings have common I/O.