How to type double angle quotation marks in Windows/Linux?

[Syntacticlosure]

I can't easily type double-angle quotation marks in Win/Linux. I tried \ll and \gg in Drracket, but they are different symbols. M-0171 and M-0187 work in Windows but don't work in Drracket.

A convenient way to type « and » in Win/Linux should exist.

[rfindler]

Does Alt Gr+[ and Alt Gr+] work?

[samth]

I have mostly used copy and paste on Linux, but on my en-us keyboard layout I don't think AltGr exists.

[AlexKnauth]

When I was testing things for helping on How to Type «…»:

The most convenient way I found on Windows was Alt while numpad 174 for «, or Alt while numpad 175 for ». The 3-digit 174 and 175 seem easier to remember, especially because the numbers are right next to each other, compared to 0171 and 0187 being different in 2 of their digits.

The most convenient way I found on Linux was using the Compose key. I had to go into the keyboard settings to set the Compose key to something (I happened to pick Right-Alt). But then I could just type Compose << for «, or Compose >> for ».