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## Issue

### Description

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Describe the problem addressed by this PR.

Example: The variable name `rnd` could be misinterpreted as an abbreviation of *random*, but it refers to the current server round.
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### Related issues/PRs

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## Proposal

### Explanation

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### Checklist

- [ ] Implement proposed change
- [ ] Write tests
- [ ] Update [documentation](https://flower.ai/docs/writing-documentation.html)
- [ ] Make CI checks pass
- [ ] Ping maintainers on [Slack](https://flower.ai/join-slack/) (channel `#contributions`)

### Any other comments?

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