: Likely a shorthand code for the specific game (e.g., Cities: Skylines 2 or similar titles) and the part size (2GB chunks).
: Many useful posts containing these links also provide "Check-sums" (MD5 or SHA-1) to verify that your download isn't corrupted. DODIC2R2GB.part04.rar
: The name of the well-known repacker who compresses large games for easier downloading. : Likely a shorthand code for the specific game (e