A In the positions column of some charts, an "A" refers to a title which has been added to the playlist.
C This column on a report will have an indicator of G, P, or it will be blank. This certification is to signify that the title is either Gold, Platinum, or neither.
Category This field refers to (L) Label, (D) Distributing Label, or (C) Corporation.
D A "D" in the positions column of a chart refers to a title that has been dropped from the playlist.
Dance Club Reports These reports will be dynamically generated based on the survey data submitted by reports (DJs).
H On a dance club chart, an "H" in the position column means that the title is in heavy rotation.
Issue Date The date that a Billboard chart is actually issued in print.
L On a dance club chart, an "L" in the position column means that the title is in light rotation.
M On a dance club chart, an "M" in the position column means that the title is in medium rotation.
Points This figure is based on the weight of the reporter and the position the title holds on the chart.
R On a dance club chart, an "R" in the position column means that the title is recurrent.
RU A "RU" in the positions column of a chart refers to reuse. For whatever reason, the same chart is being used as the previous date, so "RU" will appear in each spot of the position column.
X An "X" in the positions column of a chart refers to an extra title.