HPE ProLiant DL180 Gen10

The arrow points to the front of the server.
Processor, heatsink, and socket components
Item
Description
1 Heatsink nuts
2 Processor carrier
3 Pin 1 indicator
1
4 Heatsink guide/keying feature
5 Alignment post
6 Heatsink keying frame
1
Symbol also on the processor and frame.
Component identification 22