This character replaces a dollar sign at the end of a Unix command prompt with root access.
A complexity class whose name begins with this character was introduced in the computation of the permanent of a matrix of all zeros and ones, and contains all counting problems that correspond to a decision problem in NP. In Unix systems, files that will invoke an interpreter directive begin with this character. This character replaces a dollar sign at the end of a Unix command prompt with root access. In Perl, a dollar sign followed by this symbol accesses the last index of an array. This character and an exclamation mark comprises a shebang. "Include" directives in C begin with this symbol, which is appended to the names of several programming languages included in Microsoft's .NET ("dot-net") framework. For 10 points, name this symbol used to comment code in Perl and Python, which appears in the name of the C-sharp language.
A complexity class whose name begins with this character was introduced in the computation of the permanent of a matrix of all zeros and ones, and contains all counting problems that correspond to a decision problem in NP.
number sign [or pound sign; or hash sign; accept sharp sign or #; accept sharp-P or sharp-P-hard or #P or #P-hard; accept C-sharp or C# until “sharp” is read] &lt;Other Science (Computer Science)&gt;