It's called an "engine code indentification label" on the
right/passenger side valve cover. It contains the engine build date,
engine plant code, engine code, initial igniton timing, and shipping
information

Also, FYI there is an "Emission Calibration label" on the driver side
door pillar that contains, the engine code, engine calibration number,
and revision level.

Both of these labels are used to determine if parts are unique to
specific engines.