What does the "U" button/letter mean in front of parameters in Archicad?

[Tai ChenYi]

In Archicad’s parameter list, every parameter seems to have a "U" shown in front of it (for example, before AC_show2DHotspotsIn3D).
What does this "U" stand for, and what is its function?

Thanks in advance for your help! 🙏

[Barry Kelly · Accepted solution]

U = Unique.

From the reference manual ...

Barry.

[Tai ChenYi]

Got it. So the point is to prevent that parameter from being passed to another object, like special marker text (e.g., the 'X' symbol explanation).
Thanks for clarifying!

[runxel]

Caveat, beware!:

This is only true when you use the syringe inside the tool window to transfer settings between different objects, NOT while in the plan!

[Lingwisyer]

That feels like a really bit caveat... I wonder why it is split like that...