Another engine ID irregularity…..

View attachment 137456 Finally got the motor pulled, and I'm starting my minor rebuild.
I cleaned up the block a bit, and found the cast code. I tried looking it up, but there are some discrepancies with a few letters.
I'm wondering what the "LL" underneath the code stands for, as well as the strange looking circle design.
Was someone at the factory just personalizing the block, or is it a special code for something?
Out of what research I did, there was no reference to either.
Author: Progrocker74