I believe it refers to "Walks" plus "Hits" per inning. Add the total number of Walks and the total number of Hits allowed by a pitcher, then divide by the total number of innings he pitched, and you get WHP.
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WHP, also referred to as a pitcher's "WHIP" is the total number of walks and hits allowed per inning pitched. Similar to calculating opponents batting average, but also takes into account walks. Hits allowed plus walks allowed divided by innings pitched.