Finite-conjugate-join-closed subnormal subgroup

Definition
A subgroup of a group is termed finite-conjugate-join-closed subnormal if the join of finitely many conjugate subgroups to it is subnormal subgroup.

Stronger properties

 * Weaker than::Normal subgroup
 * Weaker than::2-subnormal subgroup
 * Weaker than::3-subnormal subgroup:
 * Weaker than::Join-transitively subnormal subgroup
 * Weaker than::Join-transitively subnormal subgroup of normal subgroup:

Weaker properties

 * Stronger than::Subnormal subgroup