Sign Your Card. The whole point of a signature is not that it is a secret symbol known only to you, but that only you can accurately duplicate it on command. It is not that hard for anyone can see a copy of your signature from public records, from a canceled check, and of course, from the credit card receipts you must sign.
A National Stock Number (NSN), as it is known in the US, or a NATO Stock Number, is a 13-digit numeric code identifying all the standardized material items of supply as they have been recognized by all NATO countries including the US Department of Defense.
NSLOOKUP is a service to look up information in the DNS (Domain Name System [RFC1034, RFC1035, RFC1033]). The NSLOOKUP utility is a unix tool. If you want to learn more, here is the nslookup manual (man page). Basically, DNS maps domain names to IP addresses. Although this web online service can query a specific DNS server, in most cases it may be sufficient and convenient just to use the KLOTH.NET default nameserver ns.kloth.net or localhost/127.0.0.1.