What are the icons in the corner of the teletype screen?

I’ve searched in all documentation without any hints about the symbols. The / seems to be slew and M is for metronome, but what does the rest mean?

Update: I just found the delay icon in the #6 of teletype studies.
Update2: …and the stack icon on the same page.


:ok:. I still don’t know what the leftmost icon (the dots). I can tell from old screenshots that It looks like it was introduced in 1.1.
The 1.1 addendum doesn’t mention it.
Please help!

this is the indicator if you mute an input with MUTE x

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Thanks. That’s one of the commands I haven’t used yet.