Not to perpetuate stereotypes, but I picture an engineer, who would have trouble communicating with another person face-to-face, happily coming up with these pictures, absolutely certain their meanings are crystal-clear.
The first one means "non-chlorine bleach" and the second means "no dry cleaning." Doh! Of course, a triangle with slanted lines can only mean non-chlorine bleach. And the "no dry cleaning" symbol should not be confused with this:
Which means, "Do not tumble dry."
Then, this light went off on my car's dashboard:
To me, this looks like a rear-end.
But, no, it means the pressure in one of my tires is off.
I can't even show you the ones on my printer, since the designer helpfully printed them black on a black background and located them near the hinge where the copier cover opens only so far. You actually need to use a flashlight to sort-of make them out. Just what I want to do when my freaking printer doesn't work.
Still, it is this pictograph, located in the trunk of a car, on the escape latch, that remains my favorite: