For me i took it as the stencils are informative to the ground and air crew of things, so would be on top of other markings, i struggle to read them anyway so couldn't say what they actually say or if they are upside down at times when i put them on with them been so small. Never given much thought to it till now its just the way i have seen them on aircraft at air shows and on photographs, maybe i should pay more attention to them in the future.