datamarker

Datamarker is a visual symbol that represents a single data point on a chart or map. Also called a data marker or point marker, it functions as the graphical glyph used to locate and identify observations within a data visualization. In common chart types such as line charts, scatter plots, and bar charts, datamarkers mark where a value occurs and can be customized to convey additional information about the data.

Datamarkers have several adjustable properties. Shape can be circle, square, triangle, diamond, or custom icons; size and color can be varied to reflect magnitude, category, or other dimensions. In many tools, the fill and outline styles are configurable, and markers can be hidden for certain series or displayed only for highlighted points.

Interactivity is a common feature. Markers can respond to user actions by showing tooltips, details on demand, or by toggling related data series. In maps, datamarkers often indicate locations and can encode attributes such as category, status, or intensity through color, size, or iconography.

Datamarkers are distinct from data labels, which display textual values or category names. They are also separate from the data point itself in data structures, serving primarily a visual anchor for readers. Best practices include ensuring adequate contrast, using consistent shapes for similar categories, and avoiding overcrowding by clustering or filtering markers in dense areas.

Terminology varies by software; many documentation sources simply refer to them as markers or data points. The concept remains a standard element of effective data visualization and geographic information displays.