Three dots stacked vertically, a vertical ellipsis used in matrices for omitted rows; looks like the kebab menu icon.
U+22EDDOES NOT CONTAIN AS NORMAL SUBGROUP OR EQUALU+22EFMIDLINE HORIZONTAL ELLIPSISU+22ECNOT NORMAL SUBGROUP OF OR EQUAL TOU+22F0UP RIGHT DIAGONAL ELLIPSISU+22EBDOES NOT CONTAIN AS NORMAL SUBGROUPU+22F1DOWN RIGHT DIAGONAL ELLIPSISU+22EANOT NORMAL SUBGROUP OFU+22F2ELEMENT OF WITH LONG HORIZONTAL STROKEU+22E9SUCCEEDS BUT NOT EQUIVALENT TOU+22F3ELEMENT OF WITH VERTICAL BAR AT END OF HORIZONTAL STROKEU+22E8PRECEDES BUT NOT EQUIVALENT TOU+22F4SMALL ELEMENT OF WITH VERTICAL BAR AT END OF HORIZONTAL STROKE256 characters in the Mathematical Operators Unicode block, from number 239.
U+22EEVERTICAL ELLIPSISU+22EFMIDLINE HORIZONTAL ELLIPSISU+22F0UP RIGHT DIAGONAL ELLIPSISU+22F1DOWN RIGHT DIAGONAL ELLIPSISU+22F2ELEMENT OF WITH LONG HORIZONTAL STROKEU+22F3ELEMENT OF WITH VERTICAL BAR AT END OF HORIZONTAL STROKEU+22F4SMALL ELEMENT OF WITH VERTICAL BAR AT END OF HORIZONTAL STROKEU+22F5ELEMENT OF WITH DOT ABOVEU+22F6ELEMENT OF WITH OVERBARU+22F7SMALL ELEMENT OF WITH OVERBARU+22F8ELEMENT OF WITH UNDERBARU+22F9ELEMENT OF WITH TWO HORIZONTAL STROKESU+22FACONTAINS WITH LONG HORIZONTAL STROKEU+22FBCONTAINS WITH VERTICAL BAR AT END OF HORIZONTAL STROKEU+22FCSMALL CONTAINS WITH VERTICAL BAR AT END OF HORIZONTAL STROKEU+22FDCONTAINS WITH OVERBARU+22FESMALL CONTAINS WITH OVERBARU+22FFZ NOTATION BAG MEMBERSHIP