What is this symbol in Eagle and equivalent for altium
I suspect that those are testpoints.

On the schematic, I would use a single-pin connector symbol.  Altium may have a suitable schematic symbol in its libraries somewhere, but it may be easier to make your own symbol than finding something suitable in the libraries.

On the PCB, I would use a footprint consisting of a single pad of some convenient size.

You could, of course, simply ignore them, if you wish.