This template can be used at the top of a page, section, etc. to note that there is a main article for the page. Best suited for category pages.
Usage:

{{Main|1|2|3}}

Where 1, 2, 3 are the main article titles. 2 and 3 are optional. It links them, so for example:

{{Main|Objects}}

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The main article for this template is [[{{{1}}}]]