Less-than sign stacked over an equals sign over a greater-than sign, used in math for less than, equal, or greater than relations.
U+22D9VERY MUCH GREATER-THANU+22DBGREATER-THAN EQUAL TO OR LESS-THANU+22D8VERY MUCH LESS-THANU+22DCEQUAL TO OR LESS-THANU+22D7GREATER-THAN WITH DOTU+22DDEQUAL TO OR GREATER-THANU+22D6LESS-THAN WITH DOTU+22DEEQUAL TO OR PRECEDESU+22D5EQUAL AND PARALLEL TOU+22DFEQUAL TO OR SUCCEEDSU+22D4PITCHFORKU+22E0DOES NOT PRECEDE OR EQUAL256 characters in the Mathematical Operators Unicode block, from number 219.
U+22DALESS-THAN EQUAL TO OR GREATER-THANU+22DBGREATER-THAN EQUAL TO OR LESS-THANU+22DCEQUAL TO OR LESS-THANU+22DDEQUAL TO OR GREATER-THANU+22DEEQUAL TO OR PRECEDESU+22DFEQUAL TO OR SUCCEEDSU+22E0DOES NOT PRECEDE OR EQUALU+22E1DOES NOT SUCCEED OR EQUALU+22E2NOT SQUARE IMAGE OF OR EQUAL TOU+22E3NOT SQUARE ORIGINAL OF OR EQUAL TOU+22E4SQUARE IMAGE OF OR NOT EQUAL TOU+22E5SQUARE ORIGINAL OF OR NOT EQUAL TOU+22E6LESS-THAN BUT NOT EQUIVALENT TOU+22E7GREATER-THAN BUT NOT EQUIVALENT TOU+22E8PRECEDES BUT NOT EQUIVALENT TOU+22E9SUCCEEDS BUT NOT EQUIVALENT TOU+22EANOT NORMAL SUBGROUP OFU+22EBDOES NOT CONTAIN AS NORMAL SUBGROUPU+22ECNOT NORMAL SUBGROUP OF OR EQUAL TOU+22EDDOES NOT CONTAIN AS NORMAL SUBGROUP OR EQUALU+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