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2. Trapdoor - Wikipedia

   en.wikipedia.org/wiki/Trapdoor

   A trapdoor or hatch is a sliding or hinged door that is flush with the surface of a floor, ceiling, or roof. [1] It is traditionally small in size. [2] It was invented to facilitate the hoisting of grain up through mills, however, its list of uses has grown over time. [3]

3. Mantrap (access control) - Wikipedia

   en.wikipedia.org/wiki/Mantrap_(access_control)

   An intercom and/or video camera are often used to allow the guard to control the trap from a remote location. In an automatic mantrap, identification may be required for each door, sometimes even different measures for each door. For example, a key may open the first door, but a personal identification number entered on a number pad opens the ...

4. Build a better mousetrap, and the world will beat a path to ...

   en.wikipedia.org/wiki/Build_a_better_mousetrap...

   "Build a better mousetrap, and the world will beat a path to your door" is a metaphor about the power of innovation. It originated, in a somewhat different form, with Ralph Waldo Emerson . [ 1 ] [ 2 ] The epigram as known today, which specifies "mousetrap", probably also originated with Emerson, although the evidence for this is indirect.

5. Trap primer - Wikipedia

   en.wikipedia.org/wiki/Trap_primer

   A trap primer (or trap seal primer) is a plumbing device or valve that adds water to traps.The water seals in traps are needed to prevent sewer gases from entering buildings, but because this water is exposed to the air, it is subject to evaporation over time in infrequently used floor drains, leading to the release of sewer gas into the environment.

6. Trapdoor (disambiguation) - Wikipedia

   en.wikipedia.org/wiki/Trapdoor_(disambiguation)

   A trapdoor is a door set into a floor or ceiling. Trapdoor or Trap Door may also refer to: Trap Door, a science fiction fanzine; The Trap Door, a British animated TV series The Trap Door, a computer game based on the animated series; Trapdoor (software), a piece of computer software used for network administration

7. Outhouse - Wikipedia

   en.wikipedia.org/wiki/Outhouse

   The decoration on the outhouse door has no standard. The well-known crescent moon on American outhouses was popularized by cartoonists and had a questionable basis in fact. There are authors who claim the practice began during the colonial period as an early "mens"/"ladies" designation for an illiterate populace (the sun and moon being popular ...