"FUN" appeared, appropriately, on the Fun page of the New York World on Sunday, December 21, 1913. Above and below were empty squares, though, arranged like a diamond and with numbers inside leading to clues for more words to fill in.
The puzzle was a success. For a few weeks, more of its sort appeared under the heading "word-cross" — until one typesetting error rendered that "cross-word" and another, it appears, got rid of the hyphen to form "crossword", the title under which Arthur Wynne's invention has been known ever since.
In Mac OS X Mail, renaming flags is no puzzle, and you need not know typesetting either:
›› Do you like to highlight messages with colorful flags in Mac OS X Mail? Would you like to give the flags meaningful names to go with their colors? Here's how to rename the seven colored flags in Mac OS X Mail.