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Pr,

symbol for the element praseodymiumpraseodymium
[Gr., =green twin], metallic chemical element; symbol Pr; at. no. 59; at. wt. 140.90765; m.p. 931°C;; b.p. 3,512°C;; sp. gr. about 6.8; valence +3 or +4. Praseodymium is a soft, malleable, ductile, silver-yellow metal.
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Pr

(chemistry)

PR

On drawings, abbr. for “pair.”

PR

(1)

pr

(networking)
The country code for Puerto Rico.
References in periodicals archive ?
PRS allows for non-confrontational competition to get the "right" answer, and promotes a sense of community among the class and pride in class achievement when everyone selects the correct answer.
The PRS Q-80G will enable the design of single-stage switch fabrics with up to 32 ports for NPUs that support OC-192c, 10-Gbps and multi-Gigabit Ethernet (GE) applications, or up to 128 ports for NPUs that support OC-48c and multi-GE applications, or any intermediate mix of those ports.
Equally compelling is that the PRS 5G and PRS 20G devices continue the PRS portfolio's legacy of inherent support for efficient and cost-effective customer-driven evolution paths; it's one of the most popular hallmarks of the PRS family.