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Two stacked wavy strokes, meaning 'roughly equal to'.
Also known as: Approximation sign, Roughly equals, Almost equal to, Double tilde
The approximation sign states that two quantities are close but not exactly equal — a rounded value, or a result of measurement.
States that two quantities are approximately equal, as in π ≈ 3.14.
Contexts: Mathematics
Is used for rounded values and measured results, where exact equality would be a stronger claim than the evidence supports.
Contexts: Mathematics
Is not a tidier version of the single wave. One wave is the tilde operator, marking asymptotic equivalence, geometric similarity or a statistical distribution; two stacked waves mark approximation. Handwriting erases the difference and the two mean different things.
Contexts: Mathematics
Two wavy horizontal strokes, one above the other.
One wave is equivalence, similarity or distribution; two waves is approximation.
Both are two stacked horizontal strokes; the approximation sign's are wavy. Recorded as visual similarity rather than confusion, because reciprocal confusion would need evidence from the equals sign's side too.