Section 398

According to section 398 of Indian penal code, if, at the time of attempting to commit robbery or dacoity, the offender is armed with any deadly weapon, the imprisonment with which such offender shall be punished shall not be less than seven years.
A person is said to be “armed with a weapon” when he has a weapon with him and carries it, intending to use it should the occasion require so. It is sufficient if the offender carries a dangerous weapon in such a manner that a person feels that it can be used at any moment against him.