Falling on Unusual Volume

What does this mean?
SymbolNameLast TradeChangeVol. % Changeat Investors.com
ARUNAruba Networks, Inc.21.35 Aug 29Up 0.17 (0.80%)701%Stock Checkup
MTDRMatador Resources Company Commo27.36 Aug 29Up 0.73 (2.74%)438%Stock Checkup
SALERetailMeNot, Inc.18.65 Aug 29Up 0.04 (0.21%)348%Stock Checkup
HIBBHibbett Sports, Inc.45.43 Aug 29Down 0.39 (0.85%)296%Stock Checkup
PHHPHH Corp Common Stock23.96 Aug 29Up 0.23 (0.97%)275%Stock Checkup
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