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X(1), X(19), X(3375), X(3384), X(9219), X(9275) A1B1C1 : cevian triangle of X(110) A2, B2, C2 : intersections of the Brocard axis with the sidelines of ABC 

Q121 is an unicursal quartic with triple point X(1). The tangents at this point pass through X(21), X(1094), X(1095) respectively. The tangents at A, B, C concur at X(1109). Q121 is the locus of inflexion points of the cubics (KT) described in the page K457. 
