\usecounter (LaTeX2e unofficial reference manual (November 2018))

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### 13.2 `\usecounter`

Synopsis:

    \usecounter{counter}

Used in the second argument of the `list` environment (see list), this declares that list items will be numbered by counter. It initializes counter to zero, and arranges that when `\item` is called without its optional argument then counter is incremented by `\refstepcounter`, making its value be the current `ref` value (see \ref). This command is fragile (see \protect).

Put in the document preamble, this example makes a new list environment enumerated with testcounter:

    \newcounter{testcounter}
    \newenvironment{test}{%
      \begin{list}{}{%
        \usecounter{testcounter}
      }
    }{%
      \end{list}
    }

Unofficial LaTeX2e reference manual