Na

NA, N.A., Na, or n/a may refer to:

• Na (state) or 那, a small state of Zhou Dynasty
• Namibia's ISO country code
  • .na, the top-level domain for Namibia
• North America, a continent

Nå may refer to:

• Nå is the Norwegian word for now
• Nå, Ullensvang, a village in Ullensvang municipality, Hordaland county, Norway
• Nå (magazine), a Norwegian magazine that was published from 1952 until 1995

.NA is the Internet country code top-level domain (ccTLD) for Namibia corresponding to the two letter code from the ISO-3166 standard.

Potassium-dependent sodium-calcium exchanger also known as solute carrier family 24 (SLC24) is a type of sodium-calcium exchanger that requires potassium to function.

Sodium is a chemical element with symbol Na (from Ancient Greek Νάτριο) and atomic number 11. It is a soft, silver-white, highly reactive metal. In the Periodic table it is in column 1 (alkali metals), and shares with the other six elements in that column that it has a single electron in its outer shell, which it readily donates, creating a positively charged atom - a cation. Its only stable isotope is ²³Na. The free metal does not occur in nature, but instead must be prepared from its compounds. Sodium is the sixth most abundant element in the Earth's crust, and exists in numerous minerals such as feldspars, sodalite and rock salt (NaCl). Many salts of sodium are highly water-soluble: sodium ions have been leached by the action of water from the earth's minerals over eons, so that sodium (and chlorine) are the most common dissolved elements by weight in the oceans.