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It sits within the topics Inline spacing templates and Templates using TemplateData.
Its subject is documented across 37 Wikipedia language editions.
~3 min read
Encyclopedic overview
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Template:ns is designed to insert between 0 and 83 non-breaking (non-linewrapping) spaces rapidly according to the number assigned as its first (unnamed) parameter. If this parameter is not supplied or its value is not numeric, it inserts a default three non-breaking spaces.
Excerpted from Wikipedia’s “Template:Ns” article, available under the CC BY-SA 4.0 licence.