Wikipedia
Petit-Beurre
The "Petit Beurre", or "Véritable Petit Beurre", also known under the initials "VPB", is a kind of shortbread from Nantes, that is best known in France. It is the Petit Beurre of the LU society, which has become a success worldwide. The dry cake was invented in 1886 by Louis Lefèvre-Utile in the city of Nantes and was inspired by some English productions at the time. But the Petit Beurre of LU is not the first to appear, also LU does not have the exclusivity of the name 1.
The substantive Petit Beurre is a generic term from the past; it has a hyphen and when it is plural Petit-beurre is often misspelled. It is known in Anglo-Saxon countries as the French Petit Beurre and Turkey under the name petibör.