Of the six; the right forward is IAC http://www.iac.org/ left side aft is EAA http://www.eaa.org/ as for the other 4 they are probably british , french, ect... national aerobatic club decals like the IAC one. The triangles I am going to make a guess and say they are warning signs for either gas, oil or electrical. I want to guess the yellow is electrical, but I dont know.