Real Matrix
A real matrix is a matrix whose elements consist entirely of real numbers. The set of 
real matrices is sometimes denoted 
(Zwillinger 1995, p. 116).
See also
Complex Matrix, Integer Matrix, Matrix, Random Matrix, Real Number, Square Matrix
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References
Zwillinger, D. (Ed.). CRC Standard Mathematical Tables and Formulae. Boca Raton, FL: CRC Press, 1995.
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Cite this as:
Weisstein, Eric W. "Real Matrix." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/RealMatrix.html