Heavy water used in Nuclear reactors is also called?

Heavy water used in Nuclear reactors is also called?

نیوکلیئر ری ایکٹر میں استعمال ہونے والے بھاری پانی کو دوسرا کیا کہا جاتا ہے؟
Explanation

Heavy water, also known as Deuterium Oxide (D₂O).

It is used as a neutron moderator in nuclear reactors.

Due to its ability to slow down neutrons without absorbing them.