The minimize icon looks like a minus (−) sign, which corresponds to "minimize" action, so the current variant is OK. Aslo, the vertical line will not be understood by most of users, and the horizontal is very familiar for other-DE users.
@Chris: the "down arrow" means that the window will be minimized to the bottom panel, but Unity has a panel on left. ** Changed in: unity-asset-pool Status: Opinion => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/686133 Title: Minimize Icon Misleading in Unity -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs