Three dots in a row, opening a menu of further actions.
Also known as: Horizontal three-dot menu
Three dots set horizontally do the same job as the vertical form: they open a menu of secondary actions. The orientation is a house-style choice, not a difference in meaning.
Opens a menu of additional actions for the item beside it, exactly as the vertical form does.
Contexts: Software
Three small filled dots of equal size arranged in a single horizontal row with even gaps between them.
The same three dots turned through a right angle, with no agreed difference in meaning.
Three dots again, in a completely different setting: in code they expand a value, in an interface they open a menu.