The Convention on Prohibitions or Restrictions on the Use of Certain Conventional Weapons Which May Be Deemed to Be Excessively Injurious or to Have Indiscriminate Effects as amended on 21 December 2001, usually referred to as the Convention on Certain Conventional Weapons (CCW).
https://www.icrc.org/sites/default/files/external/doc/en/assets/files/other/icrc_002_0811.pdf