This is a Unity style indicator for Latte Dock
triangles style
circles style
rectangles style
unity style in parabolic effect
indicator options
From Latte UI: Effects -> Indicators -> Style -> Get New Indicators...
From command line: kpackagetool5 -i . -t Latte/Indicator
From Latte UI: Effects -> Indicators -> Style -> Get New Indicators... -> Installed
From command line: kpackagetool5 -u . -t Latte/Indicator