A downward pointing triangle is often used to represent "female".
yield right of way
yield
All three sided shapes are triangles irrespective of orientation. What would "upside down" mean anyway for a planar figure? An inveerted triangle A triangle with one point pointing south.
draw a triangle with the 1st point pointing straight up, and draw an upside down version of that on top of the first triangle.
See the legend. There's no standard "meaning" for any color on a map, though it's pretty common that blue means water.
low coolant level
Go down the hill.
The upside down purple triangle was actually used to identify Jehovah's Witnessess
One common symbol is the star of David. It is basically One equilateral triangle pointing upwards, and one overlapping equilateral triangle pointing downwards.
I think the "Fallout Shelter" sign
This usually indicates the email was SPAM.
Alkaline Trio