0
{{ Category count only}} simply returns the number of pages in a category, with no extra surrounding text.
The first unnamed parameter, mandatory, is the category name to be counted.
A second unnamed parameter, optional, may be used to count several subsets of that category, as described in
mw:Help:Magic words#Statistics.
{{
Category count only|Wikipedia articles with VIAF identifiers}}
→ 0{{
Category count only|Trees|all}}
→ 144{{
Category count only|Trees|pages}}
→ 122{{
Category count only|Trees|subcats}}
→ 22{{
Category count only|Trees|files}}
→ 0
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