Connecting rod squirt holes?
Anchor slots are the flat tabs in the cap and rod that are used to oppose each other and keep the bearing from spinning. Here they are shown below:
Here shows the cap and rod with the anchor slots circled in red, and the squirt hole in yellow. The anchor slots always go back to back. The anchor slot on the rod goes on the same side as the anchor slot on the cap as shown in the first picture above. Same with the main bearings.
The squirt hole points to the center of the engine or opposite cylinder and the anchor slots go to the outboard side of the engine when installed.