GnuPG --edit-key, help req.

[Nicky]

What does the usage letters mean in the key listing?
  usage: CS
  usage: SEA
What does SEA stand for? I think S and E stand for Signing and Encryption  
respectively but what about A and C?

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Download PGP Public Key for Nicky:
https://keyserver2.pgp.com:443/vkd/DownloadKey.event?keyid=0xC0C5F557057AC4BC

Key fingerprint = 79FD 0A0A A997 C52A 9133  86D9 C0C5 F557 057A C4BC