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This article provides definitions for frequently used terms:

Common Terms



A package contains one or more components, which are stored in a single repository and distributed as a single NPM package.

Specific Terms

This is a short list of the core chart elements. You can read more about them in the Chart Elements Overview article and the rest of the articles in the Elements section.


(Plural axes) A fixed reference line for the measuring coordinates.

Chart Area

A container for all Chart elements.


Lines which are perpendicular to the axes and enable the user to see the exact value at the current cursor position.

Error Bars

Indicate the variability of the Chart data.

Plot Area

A container for the data that is enclosed between the axes.

Plot Band

Highlight a specific range of an axis.


(Plural series) A list of data points with a set visualization type—for example, line, column, and others. The data points can be plain numbers, arrays (tuples), or objects.


A data structure which consists of multiple parts—for example, (1, 2), ('a', 'b', 4). In JavaScript, tuples are typically represented as arrays.