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Two minus signs lowering a value by one.
Two minus signs subtract one from a variable in place, the counterpart of the increment operator and following the same prefix and postfix rule.
ECMAScript defines both the prefix and postfix forms: each subtracts one from the operand, differing in the value the expression produces.
Contexts: Software
Two short horizontal strokes set side by side at mid height, level with one another and evenly spaced.
Both are used in software contexts.