Likely a date stamp ( February 23, 2023 ) or a specific Project/Case ID.
Often used as an abbreviation for "Hold" or "Hilde" , sometimes referring to a specific department or legal hold status. GF230223-HLDE-EMP.part04.rar
Because this is part04 , it contains incomplete data. Opening it individually will result in a "missing volume" error in software like WinRAR or 7-Zip. Likely a date stamp ( February 23, 2023