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A plus, a minus, a bar or a chamfer showing which way round.
Also known as: Component polarity marking, Orientation marking, Pin one marking
Polarity is marked on components by several unrelated devices — a plus sign, a bar on a diode body, a chamfered corner on a connector, a longer lead on an LED — and no single convention covers all of them. Knowing which marking a component family uses is the practical skill.
Indicates the required orientation of a component through a plus sign, a printed band, a chamfered corner, a notch or a longer lead.
Contexts: Technical drawing, Electrical equipment
Follows no single convention across component families, so the marking must be read against the family rather than by a general rule.
Contexts: Technical drawing, Electrical equipment
A printed plus or minus, a band around one end of a cylindrical body, a bevelled corner, or a dot beside one pin.