[johnsonjo]

Apparently it's a typo for löyly a finnish word which apparently means steam [0]. The author probably only heard the word pronounced. Anyways, to find this out I merely looked up "pouring water on sauna rocks" instead of trying to look up loyle.

> The primary function of sauna rocks is to generate steam when water is poured onto them. This process, known as löyly in Finnish culture, releases the heat from the rocks in the form of steam, adding humidity to the sauna environment. This humidity helps to open the pores and create a more comfortable and relaxing experience. [1]

[0]: https://translate.google.com/?sl=auto&tl=en&text=l%C3%B6yly&... [1]: https://eligoria.com/blogs/saunas/are-you-supposed-to-put-wa...