What phenomenon is depicted in the given figure?

The chemical method of contraception includes:

Vasectomy has no effect on the sexual life of a male because:

$A$: Periodic abstinence is a natural method of contraception in which couples avoid or abstain from coitus from day $10$ to $17$ of the menstrual cycle,when ovulation is expected.
$R$: Day $10$ to day $17$ of the menstrual cycle is considered a safe period.

Copper releasing $IUDs$ are used for suppressing the

Which of the following is used for emergency contraception?