What does Y and T mean please?

[Studiot]

What do the letters Y and T mean when placed instead of dates in the thread listings?

As a newbie here is there any other forum nomenclature I need to know about please?

Is there a link to key page?

Such a link could be usefully added to the welcome Email.

Thanks.

 

[cristo]

They mean Yesterday and Today.

I don't think there is a key page, as of yet.

 

[Studiot]

Thanks