The contents of onames.h is generated automatically during compile-time by makedefs from the data in objects.c and artilist.h This file contains all the object name definitions, eg. #define DAGGER 17 #define ELVEN_DAGGER 18 #define ORCISH_DAGGER 19 #define SILVER_DAGGER 20 Rings have RIN_ -prefix, eg. #define RIN_PROTECTION 155 #define RIN_REGENERATION 156 Potions have POT_ -prefix, eg. #define POT_LEVITATION 274 #define POT_HALLUCINATION 275 Scrolls have SCR_ -prefix, and spellbooks SPE_ Wands have WAN_, eg. #define WAN_DIGGING 380 #define WAN_MAGIC_MISSILE 381