How can i guess a key that i don't see?

Hello,

I see a key with three points...
http://c2n.me/3AscHK1.jpg

It's not _sys_sm_join because this key is ok
How can i know this key?

Didier 

I went to your site to tell you what key but you are not allow me to see that template.

Just type in the language key you see and put it in the filter box of the language search and you should be able to find it.

Thank you, but i found it.
I select the place in Google and second menu = inspect

then the computer shows it :-)

Didier