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It is catalogued under topics including Multi-column templates and Templates using TemplateStyles.
Vinony links it to 43 Wikipedia language editions.
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The columns-start template and its child templates column and columns-end can be used to make a fixed number of columns (up to 5) that will span the entire page above a certain minimum width (100 ems for 5 columns, 80 for 4, 60 for 3 and 2). Below the minimum width, each column starting from the right will gracefully display below another one of the columns.
Excerpted from Wikipedia’s “Template:Columns-end” article, available under the CC BY-SA 4.0 licence.