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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