Luna Dolphin, In my neck of the woods the L symbol stands for 90 degrees or 90 feet...Steve
Luna Dolphin,
Interprétation, like any other subject, depends on context.
Here are a couple of meanings your symbols might mean ( in no specific order):
descending/ascending (sun) night/morning, two entrances. direction/90 degrees. treasure in mound, treasure in tunnel or cave, two entrances, treasure below in cave or tunnel. fire, moon, sun, face of water. "Brothers of saint John" air, wind, blowing
Of course this depends on the orientation of your symbols. I assume your picture is oriented the way you located it... and the way you found it or read it naturally could very possibly be oriented to mislead you.
One of the first steps of following a map is orientation. That "90 degree" symbol could be very well telling you to orient the map 90 degrees..
All that you see carved might not be all of the "map". You can pretty much consider that whole wall/floor/stone a map...including all "natural" shapes of the wall/floor/stone. Remember, they choose this particular location for more than one reason. You need to consider those options also.
Example, there might be water in front of this image. This would be it is a mirror image map. This is possible, considering that your symbols are somewhat
symmetrical.
There are various ways to read your map. The map maker would take this into consideration. Example: A+B = AB
If I know (as the map-maker) that you are going to look for "AB". I am going to make sure you find "AB"...everywhere.
If you look at your picture of the cave entrance, you can see a face of a animal. a heart, a bell, and other little things. There are clues hidden in plain site. Consider the shadows, cracks, and shapes of the rocks as part of a art collage...using the same lines to create a picture. For example, take the picture of the entrance. The large shadow of the entrance is a "bell" but it also doubles as the body for the head of that animal. The ear and head of that animal also double as the lobes of the heart.
ps. L would not mean "left". That is simply way out of context.
So on and so forth...