Codeux/Textual — pull request #471 by emilyst (2014-08-04 02:14:28+00:00)
Title: Update close button to use multiplication sign

The multiplication sign is designed to have equal-length strokes and centers between the baseline and cap line rather than straddling the span from the baseline to the median (which is rarely center). It's also far less subject to the vagaries of fonts (serifs, weird metrics, and such).