To give credence to something is to believe it: I find it hard to give credence to his explanation (I don't believe it). To give credit to something is to believe in it: I don't give any credit to that theory (I don't trust it); Would you credit it! (Would you believe such a thing).
Yellow and the diamond shape represent Brazil's mineral wealth. The motto Ordem e Progresso means ‘Order and Progress’. Green stands for the vast forests. Effective date: 15 November 1889.