Terminal control/Unicode output

The task is to check that the terminal supports Unicode output, before outputting a Unicode character. If the terminal supports Unicode, then the terminal should output a Unicode delta (U+25b3). If the terminal does not support Unicode, then an appropriate error should be raised.

Terminal control/Unicode output is a draft programming task. It is not yet considered ready to be promoted as a complete task, for reasons that should be found in its talk page.