Circled dash-sign operator, U+229D, ⊝ see also ⊕ (circled plus), ⊖ (circled minus), ⊗, ⊘, ⊜ and ⦵, ⦶, ♁Cf. U+1F714 🜔 ALCHEMICAL SYMBOL FOR SALT, where the line intersects the circle
Own work
This vector image was created with Inkscape by User:ZooFari, and then manually edited by sarang