In image below, the naming is at bottom.
while in another instance it is up.
what this means?
it means, that an axis has an internal direction. Like an face has two sides.
If you'll use it for a pattern, the default direction will be shown, but could be changed of course:
Ok. But in action, where this can become useful? For me, it had just negative impact while replacing components in assembly.
If useful or not: A line or axis or edge has two directions, a face has two sides - wether you like it or not.
Jehan, your shared observation is immensely valuable to me. For a long time, I have been looking for a visual indicator of axis polarity, primarily so that I can try to avoid reverse alignment errors when replacing components. Now I know where to look and compare, and that is a huge key to help me conform my components to similarity. I've asked this several times, but can't locate my own relevant past posts. Thank you!
Just to add, the positive and negative sides of a plane also have a similar shown indicator by text placement. On one side, it is left-justified, and on the other side it is right-justified. Of course, this is in addition to the far more observable (but also customizable to other-than-defaults) differences in colors of planes based on whether you're looking at the positive or negative side.
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