Resuelto
It is character called a Projective and is located at Unicode U+2305, and it represents (Numeric Keypad) Enter Key in the iconography of macOS. In the macOS version of Adobe InDesign, it is pressed to make a column break. On my MacBook Pro, which does not have a full-size keyboard with Numeric keypad on the right side, the work-around is to press Fn+Return. If you want to break to the next frame, add also the Shift key.
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