Water column, a unit of pressure relative to the weight per unit area of a column of water on Earth. The conversion is 27.7 inches WC = 1 PSI[citation needed]
Write-combining, a computing performance method of combining multiple memory writes before sending them
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The wc utility shall read one or more input files and, by default, write the number of s, words, and bytes contained in each input file to the standard output.
The wc utility shall consider a word to be a non-zero-length string of characters delimited by white space.
Some of them also had multiple occurrences of an option cause the corresponding count to be written multiple times and had the order of specification of the options affect the order of the fields on output, but did not document either of these.