[e40]

make sure you're actually at google.com and not go0gle.com

And how about the domain with a character that looks more like 'o' than '0'? There was something on HN recently about that. The example given would have completely fooled me, since it looked the same as the real domain.

[seanp2k2]

https://en.m.wikipedia.org/wiki/IDN_homograph_attack is what you're referencing, I believe :)

[Magicstatic]

Interesting enough, HN itself was actually susceptible to this and it was reported by a security researcher:

https://news.ycombinator.com/security.html