# Percentage symbol

**URL:** <https://discuss.elastic.co/t/percentage-symbol/208022>\
**Category:** Logstash\
**Created:** [November 15, 2019, 9:23am UTC](https://discuss.elastic.co/t/percentage-symbol/208022 "2019-11-15T09:23:03Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![KrisKarrots](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/kriskarrots/32/46843_2.png) [@KrisKarrots](https://discuss.elastic.co/u/KrisKarrots)\
**Post date:** [November 15, 2019, 9:23am UTC](https://discuss.elastic.co/t/percentage-symbol/208022/1 "2019-11-15T09:23:03Z")

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Hi,

I could not find information on what is the purpose of % symbol when using a field?

For example `"%{[Temp1][Temp2][Temp3]}"`

Thanks,

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**Author:** ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)\
**Post date:** [November 15, 2019, 3:09pm UTC](https://discuss.elastic.co/t/percentage-symbol/208022/2 "2019-11-15T15:09:43Z")

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That is called a sprintf reference. It is documented [here](https://www.elastic.co/guide/en/logstash/current/event-dependent-configuration.html#sprintf).

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [December 13, 2019, 3:09pm UTC](https://discuss.elastic.co/t/percentage-symbol/208022/3 "2019-12-13T15:09:47Z")

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