I know the meaning of each word is
서열 序列 rank, grade
의전 儀典 ceremony, formality, protocol, etiquette as practiced on diplomatic occasions
But i couldn't find the best term in english
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You call it the order of precedence. Quoting Wikipedia,
Order of precedence is a sequential hierarchy of nominal importance of persons. Most often it is used in the context of people by many organizations and governments, for very formal and state occasions, especially where diplomats are present.