These are the three best claims for quadrals. There are several false trails in the literature, that is, suggestions of other Austronesian languages with quadrals, which turn out in fact to have four number values not five.
Source: wiktionary
Quadral
//ˈkwɒdɹəl//
Synonyms for "quadral"
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Likewise, expression of quadral is accomplished in the same way by establishing specific locations or points in signing space.
Source: wiktionary
While the coding of the person distinctions in Tolai is not as transparent as in Tok Pisin, the coding of number shows obvious relations to the number words of this language […] perhaps evidence of a quadral that was generalized to a plural.
Source: wiktionary
Another point is that, judging from the existing descriptions, true trials are extremely rare and true quadrals do not exist.
Source: wiktionary
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.