AristotelianNBP is a great font style inspired by Greek writing, that allows you to quickly give a vintage, handwritten look to any text string.
To install the AristotelianNBP font, simply unzip the archive and place the font file (.ttf, .otf) into /Library/Fonts . The AristotelianNBP font integrates quickly into your system and you can easily access the custom glyphs through any text editing application.
Mac OS X comes with pre installed font styles and AristotelianNBP will simply be added to your pre existent library. The process is managed through the Font Book application, where you can easily browse and preview your currently installed fonts.
To learn more about dealing with the Font Book application you can easily access the Apple support page HERE.