Wiktionary
a sharp
n. (alternative spelling of A-sharp English) n. A programming language version of Ada for CLI, spelled A#.
Wikipedia
A Sharp (.NET)
A# is a port of the Ada programming language to the Microsoft .NET platform. A# is freely distributed by the Department of Computer Science at the United States Air Force Academy as a service to the Ada community under the terms of the GNU General Public License.
AdaCore has taken over this development, and announced " GNAT for .NET", which is a fully supported .NET product with all of the features of A# and more.
Usage examples of "a sharp".
Then she was screaming, too, the sound seeming to cut the moonlit air like a sharp whirling blade: 'Soooooo-zeeeeee!