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∅

∅ EMPTY SET

CodepointU+2205
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Comments null set
used in linguistics to indicate a null morpheme or phonological "zero"
BlockMathematical Operators
Sub-BlockMiscellaneous mathematical symbols
CategorySm / Symbol, math
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How to type "∅" in Windows? hold alt
type +
type 2205
release alt
How to type "∅" in Linux? hold ctrl+shift
type U 2205
release ctrl+shift