Some rules Alphanumerics Non-alphanumerics Literal glyphs a 1 _ \* \$ \. \\ \' Metasyntax \a \1 \_ * $ . \ ' Quoted glyphs 'a' '1' '_' '*' '$' '.' '\\' '\'' * All glyphs that are _, Unicode letters or numbers are *always* literal * Any other glyph is metasyntactic (*not* self-matching) * Escape metasyntax with \ * Glyphs can be made literal by placing them in quotes * Double quoting glyphs makes it literal with interpolating semantics