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<unit> 2^50 = 1,125,899,906,842,624 bytes = 1024 terabytes or roughly 10^15 bytes. 1024 petabytes is one exabyte.
Google is estimated to store about 200 petabytes of data in about 25 data centers around the world.
See prefix.
(2007-09-13)
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<unit> 10^15 flops or 1000 teraflops.
As with flops, the term ends in S in both the singular and plural as the S stands for seconds.
The first computer to perform one petaflops was recorded in June 2008. By June 2012 there were 20.
(2013-04-27)
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<tool> An Estelle to C++ translator.
(1997-01-24)
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<person> The developer of the Entity-Relationship model.
(1995-02-07)
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<parallel, simulation> A directed, bipartite graph in which nodes are either "places" (represented by circles) or "transitions" (represented by rectangles), invented by Carl Adam Petri. A Petri net is marked by placing "tokens" on places. When all the places with arcs to a transition (its input places) have a token, the transition "fires", removing a token from each input place and adding a token to each place pointed to by the transition (its output places).
Petri nets are used to model concurrent systems, particularly network protocols.
Variants on the basic idea include the coloured Petri Net, Time Petri Net, Timed Petri Net, Stochastic Petri Net, and Predicate Transition Net.
FAQ.
(1996-09-10)
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<character> /pet'skee/ PET ASCII. The variation (many would say perversion) of the ASCII character set used by the Commodore Business Machines' PET series of personal computers and the later Commodore 64, Commodore 16, and Commodore 128 computers. The PETSCII set used left-arrow and up-arrow (as in old-style ASCII) instead of underscore and caret, placed the unshifted alphabet at positions 65--90, put the shifted alphabet at positions 193--218, and added graphic characters.
(1995-10-29)
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