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Comments invisible comma
contiguity operator indicating that adjacent mathematical symbols form a list, e.g. when no visible comma is used between multiple indices
BlockGeneral Punctuation
Sub-BlockInvisible operators
CategoryCf / Other, format
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How to type "" in Windows? hold alt
type +
type 2063
release alt
How to type "" in Linux? hold ctrl+shift
type U 2063
release ctrl+shift