Simple really. 3x EMAs that you can edit, turn on and off etc.
Designed for efficiency/to save space.
Even if you don't use 3 EMAs, it's better to have it and not need it, than to need it and not have it!
Enjoy.
Open-source script
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules.
You can favorite it to use it on a chart.
Disclaimer
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