What is the meaning of "pra", "na" and "Yama" in "Pra""na""yama"? Please elaborate.

Pranayama is pranayama, a breathing control method;

Na: the English symbol of "sodium" in the periodic table of elements. It is a soft metallic element that allows water to interpret and release hydrogen. It has many compounds, such as salt (sodium chloride), Chilean saltpeter (sodium nitrate) and soda ash (sodium carbonate). Sodium is also one of the main components of human muscle and nerve tissue. Pure metallic sodium is of little use, but sodium compounds can be used in medicine, agriculture and photographic equipment. Sodium chloride is salt. Liquid sodium is sometimes used to cool nuclear reactors (sodium-potassium alloy is liquid at room temperature, which is the thermal conductor of nuclear reactors and plays the role of transferring the heat generated by the reactors to steam turbines. In the past, sodium metal was mainly used to make antiknock agent for automobile gasoline, but it has been decreasing day by day because it will pollute the environment. Metal sodium is also used to prepare titanium and produce sodium hydroxide, sodium amino, sodium cyanide, etc. Molten metal sodium can be used as a heat exchanger for value-added reactors.

Pra: Hereditary retinal degeneration in dogs

Ama: Yan Mo, Yan Luowang.