Cool components of confirmed symbiotic stars. Upper panel: Distribution of spectral types. S-, D-, and D’-type systems are shown in yellow, dark red, and cyan, respectively. Middle panel: Distribution of metallicities of symbiotic giants. S-type systems with M-type giants are shown in yellow, K-type giants in olive, and D’-type systems (G giants) in cyan. Vertical red dashed lines indicate the median values for M-type giants ([Fe/H] = −0.18) and K-type giants ([Fe/H] = −1.15). Bottom panel: Distribution of pulsation periods. S-type systems (typically SR or OSARG pulsations) are shown in yellow, and D-type systems (Mira pulsators) in dark red. Vertical red dashed lines denote median periods of 92.5 days for S-types and 400 days for D-types.