"In France, Italy, Belgium, and some other civil law countries, a circulaire (French), circolare (Italian) or omzendbrief (Dutch) consists of a text intended for the members ...
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of a service, of an enterprise, or of an administration.
Within the French and Belgian civil service, a circulaire originates from a ministry with the aim of giving an interpretation of a legal text or of a regulation (a decree, arrĂȘtĂ© or Royal Order), with a view to applying such a regulation consistently. As such, a circulaire depends on the general principles of law, but carries more weight than mere administrative acts." - (en.wikipedia.org 29.11.2019)