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2. Socket wrench - Wikipedia

   en.wikipedia.org/wiki/Socket_wrench

   Socket set with ratchet (above), four hex sockets and a universal joint. A socket wrench (or socket spanner) is a type of spanner (or wrench [1] in North American English) that uses a closed socket format, rather than a typical open wrench/spanner to turn a fastener, typically in the form of a nut or bolt.

3. List of screw drives - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_drives

   Tamper-resistant versions with a pin in the recess are available. Metric sizes of the hex socket are defined by ISO 4762 (socket head cap screws), ISO 4026 (socket set screws with flat point), ISO 4027 (socket set screws with cone point), ISO 4028 (socket set screws with dog point), and ISO 4029 (socket set screws with cup point).

4. Orders of magnitude (length) - Wikipedia

   en.wikipedia.org/wiki/Orders_of_magnitude_(length)

   13 cm = 1.3 dm – body length of a Goliath birdeater; 15 cm = 1.5 dm – approximate size of largest beetle species; 19 cm = 1.9 dm – length of a banana; 26.3 cm = 2.6 dm – length of average male human foot; 29.98 cm = 2.998 dm – distance light in vacuum travels in one nanosecond; 30 cm = 3.0 dm – maximum leg length of a Goliath birdeater

5. Nut (hardware) - Wikipedia

   en.wikipedia.org/wiki/Nut_(hardware)

   Threaded socket A threaded socket for a wooden workpiece, similar to a wall anchor. Knurled nut: Thumb nut Has a knurled outside surface which facilitates tightening by hand (thumb nut) or secures the nut into a handle or cover (insertion nut) Sex bolt: Barrel nut, barrel bolt, binding barrel, Chicago screw, post and screw or connector bolt

6. Foil (fencing) - Wikipedia

   en.wikipedia.org/wiki/Foil_(fencing)

   A foil is one of the three weapons used in the sport of fencing. It is a flexible sword of total length 110 cm (43 in) or under, rectangular in cross section, weighing under 500 g (18 oz), with a blunt tip. [1] As with the épée, points are only scored by making contact with the tip. The foil is the most commonly used weapon in fencing. [2]

7. AC power plugs and sockets: British and related types

   en.wikipedia.org/wiki/AC_power_plugs_and_sockets:...

   BS 546, Two-pole and earthing-pin plugs, socket-outlets and socket-outlet adaptors for AC (50–60 Hz) circuits up to 250 V is an older British Standard for three-pin AC power plugs and sockets. Originally published in April 1934, it was updated by a 1950 edition which is still current, [1] with eight amendments up to 1999. BS 546 is also the ...

8. Accuracy and precision - Wikipedia

   en.wikipedia.org/wiki/Accuracy_and_precision

   Accuracy is also used as a statistical measure of how well a binary classification test correctly identifies or excludes a condition. That is, the accuracy is the proportion of correct predictions (both true positives and true negatives) among the total number of cases examined. [10]

9. Outline of fencing - Wikipedia

   en.wikipedia.org/wiki/Outline_of_fencing

   Piste – The fencing area, roughly 14 by 2 metres (45.9 ft × 6.6 ft). The last two metres on each end is hash-marked, to warn a fencer before he/she backs off the end of the strip. Retreating off the end of the strip with both feet gets a touch against. Going off the side of the strip with one foot halts the fencing action.