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As the comments mentioned, the 'samech mem' is the abbreviation for 'Samael' - the Yetzer Hara/Angel of Death/Archangel of Esav. You can find more written about it here as the article discusses The angel's prosecution of Yaakov (and the Jewish nation as a whole) The sa'ir l'azazel given on Yom Kippur which goes to the angel. The angel's role as Esav's ...

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