Most of the fonts at the websites below will work in editing applications such as Final Cut Pro, Sony Vegas, Adobe Premiere and AVID.
User Interface Font Size - Creative COW's user support and discussion forum for users of Adobe Premiere Pro. Also, check out Creative COW's.
How do you add additional fonts to adobe Premiere Pro CC. Can I add a font to Premiere Pro CS6? | Adobe.
Subtitles in Premiere Pro
Adobe premiere fonts - Software
There's a Windows accessory called Character Map, which when run will show you just which typefaces have images or text for that matter , and what character key they are assigned to. Check out this how-to over at Font Stock that that gives the rundown for installing fonts on Mac and all Windows operating systems. If this is the case, many of these types of fonts do not have the full font set, which would account for your seeing boxes instead of the icon or picture. If you have a Mac, I think there's a utility called Font Book which does essentially the same thing. Experience Manager Campaign Analytics.