Wood-Number 0 TB02

Please drop this item in rural or Premium Member Only caches.  Do not place it in an urban cache or leave it behind at a caching event.  Transport the bug in the original plastic bag for as long as the bag lasts; this prevents the chain and tag tangling with other items.  Otherwise, take this travel bug anywhere you wish.  No permission needed to leave the U.S.

0 is both a number and the numerical digit used to represent that number in numerals.  It fulfills a central role in mathematics as the additive identity of the integers, real numbers, and many other algebraic structures.  As a digit, 0 is used as a placeholder in place value systems.  In the English language, 0 may be called zero, nought nil, or — in contexts where at least one adjacent digit distinguishes it from the letter "O" — oh or o.  Informal or slang terms for zero include zilch and zip.  Ought or aught has also been used historically.  The modern numerical digit 0 is usually written as a circle or ellipse. Traditionally, many print typefaces made the capital letter O more rounded than the narrower, elliptical digit 0.[40] Typewriters originally made no distinction in shape between O and 0; some models did not even have a separate key for the digit 0. The distinction came into prominence on modern character displays.[40]

A slashed zero can be used to distinguish the number from the letter. The digit 0 with a dot in the center seems to have originated as an option on IBM 3270 displays and has continued with some modern computer typefaces such as Andalé Mono, and in some airline reservation systems. One variation uses a short vertical bar instead of the dot.  Some fonts designed for use with computers made one of the capital-O–digit-0 pair more rounded and the other more angular (closer to a rectangle).  A further distinction is made in falsification-hindering typeface as used on German car number plates by slitting open the digit 0 on the upper right side.  Sometimes the digit 0 is used either exclusively, or not at all, to avoid confusion altogether.