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A unit of measurement of plane angles that is equal to 1/3600th of a [[Degree|degree]], or 1/60th of a minute; it is denoted by the symbol <img align="absmiddle" border="0" src="https://www.encyclopediaofmath.org/legacyimages/s/s083/s083660/s0836601.png" />. A metric second is <img align="absmiddle" border="0" src="https://www.encyclopediaofmath.org/legacyimages/s/s083/s083660/s0836602.png" />-th of a right angle; it is denoted by the symbol <img align="absmiddle" border="0" src="https://www.encyclopediaofmath.org/legacyimages/s/s083/s083660/s0836603.png" />.