The sun shown behind a cloud, with about 20% of it visible. Very similar to the sun behind cloud emoji, but with less sun visible.
See the glossary for information on the term white in unicode character names.
Sun Behind Large Cloud was approved as part of Unicode 7.0 in 2014 under the name “White Sun Behind Cloud” and added to Emoji 1.0 in 2015.
🌥️ White Sun Behind Cloud