CFA Franc
The CFA franc is a shared currency used by the West African Economic and Monetary Union (UEMOA, 8 countries) and the Central African Economic and Monetary Community (CEMAC, 6 countries). Though technically separate currencies, they are pegged at equal value.
West African CFA zone: Senegal, Mali, Ivory Coast, Burkina Faso, Niger, Togo, Benin, Guinea-Bissau (8 countries). Central African CFA zone: Cameroon, Chad, Central African Republic, Republic of Congo, Equatorial Guinea, Gabon (6 countries). All 14 reflect historical ties to France.
In GeoHint, uses CFA franc instantly limits to these 14 countries. CFA franc + West Africa gives 8, CFA franc + Central Africa gives 6. The CFA zone strongly correlates with French-speaking hints since nearly all members are Francophone.