I overlooked that it also shows a single trailing "A," set in black serifless capitals, at the end of a line of text in black letters, under the emblem. From it, I conjecture that it reads "REGI N DE LA AURACAN A." António Martins, 19 May 2016
TYPE: proposed Regional government flag USAGE:presumably RATIO: 3:5 FIS: 2006
This flag appears in a Chilean government website with regard to the creation of a new flag for this region, to replace the existing one. It is a proposal. Sergio Arenas, 26 July 2006
The Araucanía regional flag is tierced in fess (horizontal tricolor) of blue, white, red, charged overall by the regional coat of arms. Alex Garofolo, 25 January 2016