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Capacitors C1, C2 and C3 are accompanied on this schematic by a semicircle, square and triangle symbol respectively. I'd expect the meaning of unusual symbols to be explained on the same drawing; they aren't, so perhaps they belong to a convention I've not yet encountered.

enter image description here

Link to source of schematic

Edit: Encountered these same symbols on a capacitor in the Heathkit IM-58 Harmonic Distortion Meter [though the symbols don't appear in the schematic]: enter image description here

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  • \$\begingroup\$ You should link to the source of the diagram and take note; this isn't a well drawn diagram so don't expect logic in the symbols. \$\endgroup\$
    – Andy aka
    Jan 1, 2022 at 11:55

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These are multiple electrolytic capacitors in a single package. The package would have more than the usual 2 pins, one for each capacitor and a shared ground pin. Each non-ground pin would have such a symbol next to it to identify it. The markings on the side would then state the symbols and their respective capacitances/voltages.

Here's a picture of such a capacitor. (Source: Myself).

Multiple capacitors in single package

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    \$\begingroup\$ You will probably also find these symbols stamped on the terminals themselves if you look at the base of the capacitor. I'll try to find a photo. \$\endgroup\$
    – user_1818839
    Jan 1, 2022 at 15:35
  • \$\begingroup\$ As it happens, I finally did! [Edited question to show findings]. \$\endgroup\$
    – Simon Owen
    Feb 20, 2022 at 8:19

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