I am speaking about this question: What does this placard on board an A320 denote?
As the Stackexchange network aims for a high rate of users coming from search engines and this question is about something many passengers of airplanes may ask themselves, I feel like no one would search for a "placard". They would instead search for something containing the word "black triangle" in it.
So, in terms of search engine optimization, I would change the title of the question into something like:
What does that black triangle in the cabin of passenger aircraft mean?
What would you say? Have you got a better fitting title?