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2. Mechanical pencil - Wikipedia

   en.wikipedia.org/wiki/Mechanical_pencil

   Pencils with sub-millimeter leads can usually hold multiple leads at the same time, reducing the frequency of refills. One exception was the Pentel 350 E, possibly Pentel's first mechanical pencil, [14] which could only hold a single stick of 0.5 mm lead. Refill leads can be bought in small tubes and inserted into the barrel as needed.

3. Polyethylene terephthalate - Wikipedia

   en.wikipedia.org/wiki/Polyethylene_terephthalate

   A finished PET drink bottle compared to the preform from which it is made. There are two basic molding methods for PET bottles, one-step and two-step. In two-step molding, two separate machines are used. The first machine injection molds the preform, which resembles a test tube, with the bottle-cap threads already molded into place.

4. PET bottle recycling - Wikipedia

   en.wikipedia.org/wiki/PET_bottle_recycling

   Petcore, the European trade association that fosters the collection and recycling of PET, reported that in the EU 28+2, [6] out of 3.4 Mt bottles sold, 2.1Mt of PET bottles were collected in 2018 (so around 2/3). 1.35Mt of r-PET were produced for which the end uses were: 30% sheets & films (half for food contact). (2010: 22% [34])

5. ∆ - Wikipedia

   en.wikipedia.org/wiki/%E2%88%86

   ∆ may refer to: . Triangle (∆), one of the basic shapes in geometry. Many different mathematical equations include the use of the triangle.; Delta (letter) (Δ), a Greek letter also used in mathematics and computer science

6. Lesser Sunda Islands - Wikipedia

   en.wikipedia.org/wiki/Lesser_Sunda_Islands

   Map of Lesser Sunda Islands, east of Java Satellite picture of the Lesser Sunda Islands. The Lesser Sunda Islands (Indonesian: Kepulauan Sunda Kecil, Tetum: Illá Sunda ki'ik sirá, Balinese: ᬓᬧᬸᬮᭀᬯᬦ᭄ᬲᬸᬦ᭄ᬤᬘᬾᬦᬶᬓ᭄, romanized: Kapuloan Sunda cénik), now known as Nusa Tenggara Islands (Indonesian: Kepulauan Nusa Tenggara, or "Southeast Islands"), [1] are an ...

7. e (mathematical constant) - Wikipedia

   en.wikipedia.org/wiki/E_(mathematical_constant)

   The number e is a mathematical constant approximately equal to 2.71828 that is the base of the natural logarithm and exponential function.It is sometimes called Euler's number, after the Swiss mathematician Leonhard Euler, though this can invite confusion with Euler numbers, or with Euler's constant, a different constant typically denoted .