signées

In a sentence

• Les lettres étaient signées par le directeur.

  The letters were signed by the director.

  In this sentence, 'signées' is used in its participial form, describing the letters having been signed.

• Les accords signées ont permis d'établir la paix.

  The signed agreements enabled the establishment of peace.

  Here, 'signées' modifies 'accords' and indicates that the agreements were signed prior to enabling peace.

• Les peintures, toutes signées par des artistes célèbres, sont exposées dans le musée.

  The paintings, all signed by famous artists, are displayed in the museum.

  'Signées' is used attributively within the descriptive clause, specifying that all paintings have signatures.