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2. Multiway switching - Wikipedia

   en.wikipedia.org/wiki/Multiway_switching

   A double pole, double throw switch wired to act as a four-way (intermediate or crossover) switch This article follows usage in the United States. Readers in most other countries should read "two-way" or "SPDT" for the United States "three-way"; and "intermediate", "crossover" or "DPDT" switch for the United States "four-way".

3. Two-wire circuit - Wikipedia

   en.wikipedia.org/wiki/Two-wire_circuit

   To communicate in both directions in the same wire pair, conversion between four-wire and two-wire was necessary, both at the telephone and at the central office. A hybrid coil accomplishes the conversion for both. At the central office, it is part of a four-wire terminating set, more often as part of a line card. A modern line card has no two ...

4. Symmetrical double-sided two-way ranging - Wikipedia

   en.wikipedia.org/wiki/Symmetrical_double-sided...

   This method is called symmetrical double-sided two-way ranging because: It is symmetrical in that the measurements from station A to station B are a mirror-image of the measurements from station B to station A (ABA to BAB). It is double-sided in that only two stations are used for ranging measurement – station A and station B.

5. Double switching - Wikipedia

   en.wikipedia.org/wiki/Double_switching

   A double-switched relay cannot close inadvertently with the application of the same current. At least two separate faults would be required to allow this relay to close inadvertently. Double switching , double cutting , or double breaking is the practice of using a multipole switch to close or open both the positive and negative sides of a DC ...

6. Stitch marker (crochet) - Wikipedia

   en.wikipedia.org/wiki/Stitch_marker_(crochet)

   Unlike knitting stitch markers, which are closed bands, crochet markers have open slots so that they can be removed and rehung on new rows as a craft item grows. In order to distinguish from other types of stitch markers, the markers designed for crochet use are also known as split stitch markers .

7. Crochet - Wikipedia

   en.wikipedia.org/wiki/Crochet

   Crochet (English: / k r oʊ ˈ ʃ eɪ /; [1] French: [2]) is a process of creating textiles by using a crochet hook to interlock loops of yarn, thread, or strands of other materials. [3] The name is derived from the French term crochet , which means ' hook'. [ 4 ]

8. Switch - Wikipedia

   en.wikipedia.org/wiki/Switch

   A simple on-off switch. The two terminals are normally connected together (closed) and are open when the switch is activated. An example is a pushbutton switch. SPDT Form C [4] Single pole, double throw: Two-way: Three-way: A simple break-before-make changeover switch: C (COM, Common) is connected either to L1 or to L2. SPCO SPTT, c.o. Single ...

9. Single-wire transmission line - Wikipedia

   en.wikipedia.org/wiki/Single-wire_transmission_line

   A single-wire transmission line (or single wire method) is a method of transmitting electrical power or signals using only a single electrical conductor. This is in contrast to the usual use of a pair of wires providing a complete circuit, or an electrical cable likewise containing (at least) two conductors for that purpose.