Bullseye, in philately, also called Socked on the nose (SON), refers to a cancellation of a postage stamp in which the postmark, typically a circle with the date and town name where mailed, has been applied centered on the stamp. The ideal bullseye has the entire postmark inside the margins, although this is not always possible, because the stamp may be too small or the postmark too large. The colloquial expression "Socked on the nose" does not seem to be used in Europe: the terms Oblitération centrale in French or luxus in German are in common usage.