Quite normal during manual operation. This symbol is displayed if a gear is not engaged correctly
(selector between two positions). Doesn't it tell you that in your owners manual?
See here:
http://www.manualslib.com/manual/670948/Peugeot-308.html?page=157
http://www.manuals365.com/swf/peugeot/peugeot_307_owners_manual_2007.html?page=26
http://www.manualslib.com/manual/642840/Peugeot-Rcz.html?page=134
ChicksFan, May 2014