Letterboxing Glossary: D
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- Dartmoor
- The birthplace of letterboxing, located in southwest England, home to a reputed 10,000 or more letterboxes.

- dauber duos
- A small ink pad, loved by many letterboxers for their small size and ability to do detailed stampings with multiple colors. They look like miniature pens with a small ink pad on each end.
- declination
- The difference in degrees between magnetic north and true north for a given point on earth.
- dial
- The edge of the compass housing marked with degrees.
- direction-of-travel arrow
- The arrow on the base plate of a compass that points in the direction of interest.
- discussion group
- Another term for talk list.
- dot dot dot road
- Road maps typically designate particularly scenic roads by marking the road with a series of small dots along them. On one of our road trips, Amanda and I started calling them "dot dot dot roads." For example, "Hey, Amanda! The left side of the lake is a dot dot dot road while the right side isn't, so let's go around the dot dot dot side." Then she would usually say something like, "Turn here?" while swerving across several lanes of traffic to get into the correct exit.
- Douggerware
- Sturdy, watertight plastic containers manufactured by Holiday Housewares under the name Milan. Originally touted by Silent Doug and adopted by a large number of letterboxers. A eponymous Letterbox in Douggerware was planted to honor it (and Doug).
- drain-drip
- A wide, shallow depression sculpted to drain water off a trail.
- drive-by letterbox
- A drive-by letterbox requires little or no walking and shouldn't take more than a few minutes to nab. Usually located in or near parking lots.
- duff
- Ground cover consisting of organic matter such as needles, leaves, twigs, etc.
- dye ink
- The counterpart to pigment ink, dye ink pads are quick to dry. Because they are water-based, they can bleed or run if the image gets wet. Dye ink pads should be stored upside-down to prolong their life.