According to an announcement made on 12th March 1999 the Prime Minister (Lionel Jospin) authorised the use of a state logo (shown on the right) to be used on all the documents of French ministries and administrations. It is now widely used on government documents though Government agencies which already had their own logo were not required to use this one.
Until then, the nearest the French state had to a logo was the cockerel or rooster, the cypher (uninspiring), the Liberty Cap or the fasces (neither of which were specific to France), or the fleur-de-lis (too closely associated with the Ancient Regime since it came from the royal French arms.)
On the right are the logos of the French army, navy and Air Force (These illustrations courtesy of Pierre Gay)
The French national logo is one of the gererally recognised symbols of sovereignty not mentioned in article 2 of the French Constitution of 1958, which refers only to le drapeau tricolore, bleu, blanc, rouge: The French Flag , L'hymne national, the national anthem, The Marseillaise and La devise de la République; the motto . "Liberté, Égalité, Fraternité".