The word 汇总 is formed by combining the character 汇, meaning to gather or collect, with the character 总, meaning to sum up or total, resulting in a verb that denotes the action of assembling items or data and then summarizing them into a unified result.
Word Definition - 汇总
huì zǒngvariant of 彙總|汇总[huìzǒng]; to collect and summarize; to aggregate (data, reports etc)