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2. American wire gauge - Wikipedia

   en.wikipedia.org/wiki/American_wire_gauge

   American Wire Gauge ( AWG) is a logarithmic stepped standardized wire gauge system used since 1857, predominantly in North America, for the diameters of round, solid, nonferrous, electrically conducting wire. Dimensions of the wires are given in ASTM standard B 258. [ 1] The cross-sectional area of each gauge is an important factor for ...

3. Compass (drawing tool) - Wikipedia

   en.wikipedia.org/wiki/Compass_(drawing_tool)

   A compass, also commonly known as a pair of compasses, is a technical drawing instrument that can be used for inscribing circles or arcs. As dividers, it can also be used as a tool to mark out distances, in particular, on maps. Compasses can be used for mathematics, drafting, navigation and other purposes. Prior to computerization, compasses ...

4. Circle of confusion - Wikipedia

   en.wikipedia.org/wiki/Circle_of_confusion

   At the ordinary distance of vision, of from twelve to fifteen inches, circles of confusion are seen as points, if the angle subtended by them does not exceed one minute of arc, or roughly, if they do not exceed the 1/100 of an inch in diameter. Numerically, 1/100 inch at 12–15 inches is closer to two minutes of arc.

5. Engineering drawing abbreviations and symbols - Wikipedia

   en.wikipedia.org/wiki/Engineering_drawing...

   For example, "⌀10 4X EQL SPACED ON BC" means "drill four holes of 10mm diameter equally spaced around the bolt circle." "6-Ø6.8 EQS PCD 50" means "drill 6 holes of 6.8mm diameter equally spaced on the Pitch Circle Diameter Ø50." ERC: electrical rule check EXIST. existing

6. Milliradian - Wikipedia

   en.wikipedia.org/wiki/Milliradian

   Because of the definition of pi, in a circle with a diameter of one there are 2000 π milliradians (≈ 6283.185 mrad) per full turn. In other words, one real milliradian covers just under ⁠ 1 / 6283 ⁠ of the circumference of a circle, which is the definition used by telescopic rifle sight manufacturers in reticles for stadiametric ...

7. Gauge - Wikipedia

   en.wikipedia.org/wiki/Gauge

   Gauge (firearms) Wire gauge, a measure of the size of a wire. American wire gauge, a common measure of nonferrous wire diameter, especially electrical. Birmingham gauge, a measure of ferrous wire and hypodermic needle diameter. Jewelry wire gauge, the size of wire used in jewelry making. Sheet metal gauge, thickness of metal in sheet form.

8. Unified Thread Standard - Wikipedia

   en.wikipedia.org/wiki/Unified_Thread_Standard

   The major diameter may be slightly different from the shank diameter, which is the diameter of the unthreaded part of the screw. The diameters are sometimes given approximately in fractions of an inch (e.g. the major diameter of a #6 screw is 0.1380 in, approximately 9 ⁄ 64 in = 0.140625 in). The pitch P is the distance between thread peaks.

9. Point (typography) - Wikipedia

   en.wikipedia.org/wiki/Point_(typography)

   In typography, the point is the smallest unit of measure. It is used for measuring font size, leading, and other items on a printed page. The size of the point has varied throughout printing's history. Since the 18th century, the size of a point has been between 0.18 and 0.4 millimeters. Following the advent of desktop publishing in the 1980s ...