What do the B, I, A icons next to thread titles mean?

Stephanus · Jul 23, 2015

Dear PF forum.
What are those icons at the thread title? B, I, A, etc. They are new, right?
Can someone give me the link to know that icons?

Thanks.

Bandersnatch · Jul 23, 2015

See the first thread in the forum feedback and announcements section.

Greg Bernhardt · Jul 23, 2015

Stephanus · Jul 23, 2015

Bandersnatch said:

See the first thread in the forum feedback and announcements section.

Greg Bernhardt said:

https://www.physicsforums.com/threads/new-thread-level-prefixes-b-i-a.824360/

Thank you, thank you. I already now. Intermedia, beginners, advanced. And the OP set it or the staff can correct it if necessary.

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