ISO 31-2
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ISO 31-2 is the part of international standard ISO 31 that defines names and symbols for quantities and units related to periodic and related phenomena.
Its definitions include:
| Quantity | Unit | Remarks | |||
|---|---|---|---|---|---|
| Name | Symbol | Name | Symbol | Definition | |
| period, periodic time | T | second | s | ||
| time constant of an exponentially varying quantity | τ | second | s | ||
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