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2. Pipe marking - Wikipedia

   en.wikipedia.org/wiki/Pipe_marking

   Example of pipe marking through colors and symbols (arrows) to indicated pipe contents (colors) and flow direction (arrows). Pipe marking on a natural gas pipe In the process industry , chemical industry , manufacturing industry , and other commercial and industrial contexts, pipe marking is used to identify the contents, properties and flow ...

3. AN thread - Wikipedia

   en.wikipedia.org/wiki/AN_thread

   AN sizes range from -2 (dash two) to -32 in irregular steps, with each step equating to the OD (outside diameter) of the tubing in 1 ⁄ 16-inch increments. Therefore, a -8 AN size would be equal to 1 ⁄ 2-inch OD tube. However, this system does not specify the ID (inside diameter) of the tubing because the tube wall can vary in thickness.

4. Tincture (heraldry) - Wikipedia

   en.wikipedia.org/wiki/Tincture_(heraldry)

   The metals and common colours of heraldry. One system of hatching is shown at right. Tinctures are the colours, metals, and furs used in heraldry.Nine tinctures are in common use: two metals, or (gold or yellow) and argent (silver or white); the colours gules (red), azure (blue), vert (green), sable (black), and purpure (purple); and the furs ermine, which represents the winter fur of a stoat ...

5. Aura Colors and Meanings - How to Find and Read Your Aura

   www.aol.com/aura-colors-meanings-read-aura...

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6. Pipe (fluid conveyance) - Wikipedia

   en.wikipedia.org/wiki/Pipe_(fluid_conveyance)

   Aluminum pipe or tubing may be utilized where iron is incompatible with the service fluid or where weight is a concern; aluminum is also used for heat transfer tubing such as in refrigerant systems. Copper tubing is popular for domestic water (potable) plumbing systems; copper may be used where heat transfer is desirable (i.e. radiators or heat ...

7. Do You Know Your Birthstone? Here Are the Colors and Meanings ...

   www.aol.com/lifestyle/know-birthstone-colors...

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8. Color symbolism - Wikipedia

   en.wikipedia.org/wiki/Color_symbolism

   Color plays an important role in setting expectations for a product and communicating its key characteristics. [27] Color is the second most important element that allows consumers to identify brand packaging. [28] Marketers for products with an international market navigate the color symbolism variances between cultures with targeted advertising.

9. Why tourists are being told to wipe their shoes before ...

   www.aol.com/news/why-tourists-being-told-wipe...

   Why tourists are being told to wipe their shoes before visiting the ‘world’s clearest lake’