In the windows command-line syntax, a directory is referred to by which character(s)?

'\' is the correct answer for the above question.

Explanation:

In the windows command line '\' symbol is used for the directory. In any computer system, the hard disk is a large set of memory. so the user needs to partition to make one or more part and that part is known as a drive.

The drive is the most important part of the system so it is uniquely identified on the command line by the help of '\' symbol.

Just for example if a user wants to open the D drive in a window command line by pressing D: then the command line shows--

D:\>

Hence '\' is used to refer the directory in the windows command line. Hence the answer is '\'.  

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i belive the answer you are looking for is d: the nether