Ǉ   ǈ ǉ
Those are the "Latin letter LJ" in various forms of capitalization. Highlight them and you'll see that each of those is one character, not two. I have no idea how they're used though.
The glyphs are at Unicode code points 0455 (x01C7), 0456 (x01C8) and 0457 (x01C9). They're implemented in the "Lucida Sans Unicode" font in Windows and "Lucida Grande" (I think) on the Mac.