The top portion of the FontRevealer window is populated with some sample text in 15-point Lucida Grande font. Some of the characters in the sample text are not available in Lucida Grande, so the macOS Cocoa font rendering mechanism will have automatically fetched those characters from some other font in which they are available. In the table underneath the sample text you can see which font each character was drawn from.
The sample text should look similar to the following image. Its exact appearance will depend on the fonts that are installed on your system; however, if it is significantly different, you might have a corrupted or incompatible font that will cause problems with Unicode-aware applications.
You can change the sample text to explore how font substitution behavior varies depending on the particular characters you’re using and the order in which they are written. You can also select some or (most usefully) all of the sample text and change its font using the Font menu.
Text can be selected either in the sample box or in the table. Use control-tab to switch back and forth between the two.
To change the appearance of the FontRevealer window, control-click (or right-click) on the window border area, and select a texture from the resulting popup menu.
For additional information about FontRevealer, visit our FontRevealer Product Page.