1) Bilateral 2) Bilaterally symmetric 3) Bilaterally symmetrical 4) Biradial 5) Centrosymmetric 6) Cruciate 7) Cruciform 8) Even 9) Interchangeable 10) Isobilateral 11) Isosceles 12) Parallel 13) Radial 14) Radially symmetrical 15) Regular 16) Rhombohedral 17) Stellate 18) Symmetrical 19) Trigonal 1) Bilateral 2) Biradial 3) Centrosymmetric 4) Cruciate 5) Cruciform 6) Isobilateral 7) Isosceles 8) Parallel 9) Regular 10) Rhombohedral 11) Stellate 12) Symmetrical 13) Trigonal 
• (a.) Symmetrical.
A matrix M is symmetric if for every row i and column j, element M[i,j] = M[j,i]. Contexts: econometrics; linear algebra
qualifies a two-terminal element or a two-terminal circuit for which the relations between the integral quantities remain valid if the value of each quantity is replaced by its negative NOTE 1 - An example is a resistive element characterized by an odd functional relation between instantaneous voltage and instantaneous current. NOTE 2 - The term 's...
equal and balanced when one side is compared to the other
Sym·met'ric adjective Symmetrical. 
Equally divided, and identical on both sides of a middle line; mirror image
Found on both sides of the body