Thunder symbols

[MichelleL11]

This magical seal against thunder and lightning is from a "1st half of the 15th century" medical manuscript.

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A blog article discussing it translates the circling script as ‘Quando audieris tonitruum respice hoc signum et liberaberis; In nomine patris’ (‘When you hear thunder, look at this seal and you will be freed – In the name of the Father’).

It is obviously different, but has some similarities. 

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