In Fortnite Ranked Mode, ranks are part of the competitive system introduced in Chapter 4 Season 3, and they apply to both Battle Royale and Zero Build modes. Here's a full list of all the current ranks in order:

???? Rank Categories

There are 8 main ranks, and the first 7 are divided into three sub-divisions each (I, II, III):

1. Bronze I – III

2. Silver I – III

3. Gold I – III

4. Platinum I – III

5. Diamond I – III

6. Elite (no sub-divisions)

7. Champion (no sub-divisions)

8. Unreal (top-tier rank)

???? Key Points

• Unreal is the highest and has a global leaderboard. Once you're in Unreal, you can't be demoted.

• Progression is based on your placement, eliminations, and team performance.

• Ranks reset with each new Ranked Season.

Source: InsightGirl UK