解数 is a noun referring to skill, technique, or strategic moves, often used in martial arts or problem-solving contexts. The character 解 has multiple readings; though the provided pinyin is 'jiě', the standard pronunciation for this word is xièshù. You'll encounter it in the common idiom 使出浑身解数 (shǐchū húnshēn xièshù), meaning 'to use all one's skills or tricks'.