What is another word for lettre de creance?
Pronunciation: [lˈɛtə də kɹˈiːns] (IPA) 
Lettre de Creance is a French phrase that refers to a letter of credence. It is a document that a diplomat presents to their host country's government to introduce themselves and attest to their authority. Synonyms for this term include letter of introduction or letter of embassy. In some contexts, it may also be referred to as a diplomatic letter. Letters of credence are an important element of international diplomacy and are often exchanged between countries that have formal diplomatic relations. They provide a means of establishing trust and opening lines of communication between governments.
