Two of the characters have no glyph in any font, and are marked “(n/a)”. Using a non-Unicode font, like the old TrueType Symbols font, or Wingdings, Webdings, Zapf Dingbats. If there is “(n/a) ” after the comma, that character is also not capable of being entered from the emoji keyboard in iOS 5.0.
If there is no glyph after the comma, the Unicode character/sequence is always represented using a glyph from one of the standard fonts. Glyphs shown after the comma (if any) are from the emoji-specific Apple Color Emoji font. Glyphs shown before the comma (if any) are from standard non-emoji-specific fonts (typically Apple Symbols, Zapf Dingbats, or a Japanese font from the Hiragino family).
Finally, column 4 suggests the variety of glyphs that may be used on a single platform (here Mac OS X Lion) to represent the Unicode character or sequence. For mappings to single Unicode characters, column 5 shows the glyph for that Unicode character as shown in the Unicode 6.0 charts. Within a row, the first three columns give the SJIS code and glyph for each carrier's representation (if any) of an emoji character mapped to the Unicode character or sequence shown column 6 (fallback mappings to a carrier’s set are not shown). The following table lists the 114 emoji from the core set that were mapped to (unified with) characters or sequences of characters that existed in Unicode 5.2 or earlier.