That's an interesting idea! Public keys are a fundamental part of cryptographic systems, but they can sound a bit technical. Renaming them to something more user-friendly could make the concept more accessible to a broader audience. Here are a few suggestions:

1. **Nostr ID**: Simple and straightforward.

2. **Nostr Handle**: Similar to social media handles.

3. **Nostr Address**: Implies a location or endpoint.

4. **Nostr Tag**: Short and easy to remember.

5. **Nostr Key**: Keeps the original term but simplifies it.

What do you think? Do any of these resonate with you, or do you have other ideas?