| 1. | Partial vigesimal systems are found in some European languages : Georgian.
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| 2. | Vigesimal systems are known in several European languages : Basque.
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| 3. | Vennemann regards the vigesimal system as a trait of the Vasconic language.
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| 4. | Each succeeding level of multiplication followed the vigesimal system.
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| 5. | The system was vigesimal ( base twenty ), so it has twenty digits.
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| 6. | The vigesimal numbering system, however, and the calendar, reflect Ibibio norms.
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| 7. | The system is, as is the Basque system of counting in general, vigesimal.
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| 8. | In these languages the systems are vigesimal up to 99, then decimal from 100 up.
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| 9. | Four cardinal directions, four seasons, duodecimal system, and vigesimal system are based on four.
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| 10. | Georgian has a vigesimal numeric system like Basque or French, based on the counting system of 20.
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