The running count of how many letterboxes a letterboxer has found. This number can be controversial since not everyone always agrees on what should count as a find or not.

The first person to find a letterbox.

The findability of a box is a rough measurement of how likely that the box is still in place and the clues will lead you to it. It is only a rough estimate, however, and not a precise science. As a general rule of thumb, boxes with a good findability are more likely to still be alive and well than those with average findability, which in turn are more likely to be there than those with challenging findability, which in turn are more likely to be there than those with a findability of impossible.

The findability score of a box is based on the status of the box, how many strikes it has and how long it’s been since anyone visited the box. You can check out the box listing to get additional insights. (Box comments, in particular, are a rich source of information about the current status of a box which is not reflected in the findability score.)

A flea is a non-restricted form of a cootie. You can plant it in letterboxes as if it was a hitchhiker, or on a person like a traditional cootie. You can log in with a thumbprint signature or use your signature stamps.

A box that people seem to plant for the sake of planting or getting rid of a carve... like it was flung out the window of the car.

Flugged. When you missed saying goodbye to someone when they leave the chat room.

An F-summary gives you a proverbial bird’s-eye view of the most recent finds and attempts on a letterbox. For instance, it might read something like FFFxxFFxF. The F’s represent finds and the x’s represent failed attempts, in order from left to right, so this sequence represents a find, find, find, attempt, attempt, find, find, attempt and finally a find.