Letterboxing Glossary: M
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- magnetic north
- To where the compass points, a location about 1,400 miles south of the North Pole and true north.
- Martha Stewart
- Martha joined the letterboxing lexicon on April Fools Day 2002. The perpetrator of the joke, Legerdemaine, indicated that he was contacted by 'The Martha' wanting to do a show about letterboxing—publicity that he felt the letterboxing community was not prepared to handle. Several on-going inside jokes have resulted, including the famous K-Martha hitchhiker, that have lasted through to the present day.
- MasterCarve
- A popular carving medium sold by Staedtler Mars. Most of the sizes available are famous for being so thick it can be carved on both sides, or even the edges.
- MIA
- Short for Missing In Action, a box designated as MIA is unaccounted for and presumed missing.
- microbox
- An extremely small letterbox, usually hidden in urban locations where larger boxes are too difficult to hide well. Film canisters set the standard for a microbox, but any letterbox of an equivalent size are considered microboxes.
- missing letterbox
- A letterbox that has been confirmed as missing, regardless of reason.
- mount
- The part of a stamp, usually made of wood, glued to provide structural support to the stamp and allow an even impression to be made.
- muggle
- Someone who, for some horrible reason, has never discovered the joys of letterboxing and is more likely to mistake a strange box in the woods as something evil rather than an object of great beauty and joy. A term borrowed from the well-known Harry Potter books where a muggle is someone without magic powers.
- mystery letterbox
- A letterbox whose clue does not explicitly state the starting point for the hunt. Letterboxers must figure out where to start based on sometimes cryptic (and possibly annoying!) hints contained within the clue.