Rising on Unusual Volume

What does this mean?
SymbolNameLast TradeChangeVol. % Changeat Investors.com
RXNRexnord Corporation Common Stoc29.22 1:42PM EDTUp 0.01 (0.02%)88%Stock Checkup
ACMPAccess Midstream Partners, L.P.63.92 1:44PM EDTDown 0.43 (0.67%)70%Stock Checkup
TENTenneco Inc. Common Stock64.07 1:43PM EDTDown 0.01 (0.02%)36%Stock Checkup
EXPEagle Materials Inc Common Stoc101.09 1:43PM EDTDown 0.82 (0.80%)32%Stock Checkup
JKSJinkoSolar Holding Company Limi29.70 1:43PM EDTUp 0.48 (1.63%)19%Stock Checkup

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