PE

polyethylene (PE)

Any of the polymers of ethylene, the largest class of plastics. Its simple basic structure, of ethylene monomers, can be linear (high-density and ultrahigh-molecular-weight polyethylene; HDPE and UHMWPE, respectively) or branched to a greater or lesser degree (low-density and linear low-density polyethylene; LDPE and LLDPE, respectively). The branched polyethylenes have similar structural characteristics (e.g., low crystalline content), properties (high flexibility), and uses (packaging film, plastic bags, mulch, insulation, squeeze bottles, toys, and housewares). HDPE has a dense, highly crystalline structure of high strength and moderate stiffness; uses include beverage bottles, liquid detergent jugs, crates, barrels, and luggage. UHMWPE is made with molecular weights 6–12 times that of HDPE; it can be spun and stretched into stiff, highly crystalline fibres with a tensile strength many times that of steel; uses include bulletproof vests.

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PE

(1) (Phase Encoding) An early magnetic encoding method used on 1600 bpi tapes in which a 1 is an up transition and a 0 is a down transition in the center of the bit cell.

(2) (Processing Element) One of multiple CPUs in a parallel processing system.

(3) (Professional Engineer) An engineering licensure based on a combination of education and experience. Although each state varies its regulations, the minimum requirements are a four year engineering degree from an accredited school, four years of professional engineering experience and successful completion of two stringent exams along the way. It is estimated that only about 20% of practicing engineers in the United States are licensed.

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1.	(database)	PE - periodic group
2.	(storage)	PE - Phase Encoded.
3.	(architecture)	PE - processing element.
4.	(networking)	pe - The country code for Peru.