We don't normally accept bug reports on prototype applications (see Prototype) but this is a one-line fix.

PhabricatorPhragmentApplication->getTitleGlyph() is not a valid UTF8 character. I'm not sure what it's supposed to be.

public function getTitleGlyph() {
  return "\xE2\x26\xB6";
}

It was introduced in D7726 without discussion.

@hach-que, do you remember what the intent was?

To fix:

• Select any valid UTF8 character not in use by another application (one which suits your fancy, or perhaps one discussed below by the time this task is started).
• Replace PhabricatorPhragmentApplication->getTitleGlyph() with that character.

To verify:

• Load /phragment/, observe glyph in page title (this depends on preferences, and you must enable prototype applications).

Pretty sure it was copy pasted from something else at the time; I don't believe I would have actually picked a glyph.

Unicode has a page of heiroglyphs but they don't seem to be supported yet on OSX.

But some day it will be possible to type a little picture of a duck! Computers have truly enriched our lives.