The shell bone script for character Thunder is
Both have lightning (Electricity, see Post 247) in the middle, and two 口 in the left one, and two 田 in the right one. The 口 and 田 are big wheels. Ancient Chinese believed that the big sound of thunder was from the big wheel rolling of war-god vehicle in the sky.
The big seal script for character Thunder is
The small seal script for character Thunder is
is Rain (Post 8) because the Thunder is always accompanying with raining. The bottom are 3 big wheels. But the lightning disappeared. Ancient Chinese might have thought that the thundering is with raining more than lightning.
The clerical script for character Thunder is
Its Pinyin is Lei2.
(Other related blogs
Creative Chinese Calligraphy - https://creativechinesecalligraphy.blogspot.com/2016/05/the-beautiy-of-creative-calligraphy-1.html)
Chinese Calligraphy History - https://leweishang.blogspot.com/2016/02/picto-calligraphy-new-way-to-write.html)