As known as a Strip Plot, Dot Strip Plot.

A Dot Distribution Plot visualises the data distribution across multiple categories by plotting dots along an axis. Each dot can represent a single data point or a count.

There are two variations of Dot Distribution Plot: first, the kind that plots a series of dots to compare the distributions between various categories across a single dimension. The other type is an “Instance Chart” that plots dots along a time axis to show the occurrence of multiple categories over time.

Dot Distribution Plots can be displayed either horizontally or vertically. Typically, the dots are a single colour, but colour coding can be used to distinguish categories apart or visualise an additional variable. To help make overlapping values visible, the opacity of the dots can be reduced, which can help to reveal where the data distribution is concentrated.

A Barcode Plot is a variation of a Dot Distribution Plot that uses stripes instead of dots.

Tools that can draw a Dot Distribution Plot: