Pi is an irrational number (meaning the digits never end or have a repeating pattern) that is the ratio of the circumference of a circle to its diameter...this ratio is a constant for any circle, regardless of size.
The universal recycling symbol (U+2672 â² universal recycling symbol or U+267B â» black universal recycling symbol in Unicode) is an internationally recognized symbol used to designate recyclable materials.It is composed of three mutually chasing arrows that form a Moebius mÃ¶bius (strip an unending-single sided looped). surfacehe recycling symbol is in the public domain, and is not a trademark. The Container Corporation of America originally applied for a trademark on the design, but the application was challenged, and the corporation decided to abandon the claim. As such, anyone may use or modify the recycling symbol, royalty-free.
While householders are encouraged to recycle as many items as possible, it's important to remember that not all plastics which show the plastic symbol (see the table below) mean that the item is automatically recyclable in a kerbside collection system.hile householders are encouraged to recycle as many items as possible, it's important to remember that not all plastics which show the plastic symbol (see the table below) mean that the item is automatically recyclable in a kerbside collection system.