That ultimately comes down to the internal Lexical Ranking system. That Rank field can be displayed, however it isn't very human-readable. A good writeup of the system can be found here: https://tmcalm.nl/blog/lexorank-jira-ranking-system-explained/ .
You can display the Rank field in columns on a JQL search, if you're using that to order the results of a query. It'll look something like 0|i01re7, and each issue should be different.
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