Context: Rendering software which cannot process a Unicode character appropriately often displays it as an open rectangle, or the Unicode "replacement character" (U+FFFD, �), to indicate the position of the unrecognized character. Some systems have made attempts to provide more information about such characters. The Apple's Last Resort font will display a substitute glyph indicating the Unicode range of the character, and the SIL International's Unicode Fallback font will display a box showing the hexadecimal scalar value of the character.

Question: What does rendering software display when it can't process a Unicode character? 
Answer: open rectangle, or the Unicode "replacement character"

Question: What is the code for the Unicode replacement character? 
Answer: U+FFFD

Question: What is the name of Apple's font? 
Answer: Last Resort

Question: What does SIL's Unicode Fallback font display when it can't display a character properly? 
Answer: a box showing the hexadecimal scalar value of the character

Question: What company uses the Unicode Fallback font? 
Answer: SIL International

Question: What is the Unicode for an open rectangle?
Answer: Unanswerable

Question: What company uses U+FFFD?
Answer: Unanswerable

Question: What is the glyph that Apple's Last Resort font displays?
Answer: Unanswerable

Question: What software by SIL cannot process unicode characters?
Answer: Unanswerable