The word "庚戌" is formed by combining the character 庚, representing the seventh of the ten heavenly stems in the Chinese calendrical system, with the character 戌, representing the eleventh of the twelve earthly branches. This pairing results in a compound term that denotes a specific position in the 60-year cyclical sequence, used primarily for designating years. The formation involves the direct juxtaposition of these two predefined symbols from traditional systems to create a unique identifier within the cycle.