Represents value data in graphical data
data marker
data marker
A data marker shows where a data value is on a chart, such as a line chart.
The legend is the function that identifies the data marker for each series in a chart.
data marker
nothing
A data point.
a label
On a chart, such as a line chart, a data markers shows where the point is, usually done with a dot or a box or a cross. A data label will show the actual value of that data point. So on a line chart you might see a data marker on the line to indicate it is a value from the data and with it a data label will tell you what the actual value is.
http://www.sharpie.com/enUS/MSDSSheets/default.html
The placeholder in the main document to be replaced with data in a data source is typically referred to as a "mail merge field." This field acts as a marker for where the specific data from the data source will be inserted during the merging process.
They are malleable.