What is this symbol?

[Cavi Mike]

I've never seen this before, no idea what it means.

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[obiwon]

Mirroring is active left https://diy.haascnc.com/control-icon...mill#gsc.tab=0

[Cavi Mike]

Yup that's it. There's one post for the 4th axis that always outputs backwards, I don't know why they don't delete it, looks like someone just reversed the axis on the machine instead of using the right post.