Māra/Mother/Unknown/Particular gods/Life and Death
Just as the first sign, it is a pointed triangle, but this time it is pointed down. This picture is just an example of how differently you can draw it, while still having the "pointing down" aspect.
One of the most difficult signs to understand, as the afterlife is not something Latvians were awfully concerned about, so "Death" might seem quite dark.
Also known as Māras sign, it is a sign of land and god, but, just as sky god, it is not a deity, but more of an essence of the idea and element. There are many gods of nature and most of them are women. Mother land, mother sea, mother wind, just as well mother milk and such. They are never drawn, because there is no such thing as in Greek pantheon where a man or a woman symbolizes the thing. Māra - she is the thing.
And also, as the unknown, it is considered to rule over the underworld. It is not clear what Latvians actually meant by that, as there are no signs pointing to anything like hell or the likes under the ground.