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.
The symbols for the four elements are: Earth (a downward-pointing triangle with a line through it), Air (an upward-pointing triangle), Fire (an upward-pointing triangle), and Water (a downward-pointing triangle). In alchemy, these symbols represent the fundamental building blocks of the universe and are used to describe the balance and interactions of these elements in nature and in the human body.
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
I think the "Fallout Shelter" sign
One common symbol is the star of David. It is basically One equilateral triangle pointing upwards, and one overlapping equilateral triangle pointing downwards.
Alkaline Trio