letter box
noun
variants
or letterbox
plural letter boxes or letterboxes
1
British
: a mailbox: such as
a
: a box at or near a dwelling for the occupant's mail
b
: a public box for deposit of outgoing mail
2
usually letterbox
: a container holding a rubber stamp and notebook log that is hidden in a usually outdoor location for letterboxing enthusiasts to find
Like geocaching, letterboxing involves a search for hidden containers, or letterboxes, that can be found using online clues. The letterboxes usually contain a log book and a hand-carved rubber stamp.—
The Star (Auburn, Indiana)
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Merriam-Webster unabridged



