  We study whispering gallery modes in triple microdisks of equilateral and
isosceles triangular configurations. The characteristic properties of resonant
modes in three microdisks on vertices of an equilateral triangle are explained
by discrete rotational symmetry of the triangle. The avoided crossings of
resonant modes in three microdisks on vertices of an isosceles triangle are
also studied in terms of a combination of single and coupled microdisks.
Finally, we propose the matrix models which well explain the resonant modes in
triple microdisks.
