The standard, titled "Graphical symbols for diagrams — Part 3: Connections and related devices," is a foundational document in the library of international technical documentation standards. Published by the International Organization for Standardization (ISO) , this standard establishes a "universal language" for engineering diagrams by providing a harmonized set of symbols for physical and functional connections. Scope and Technical Content
: Organizations like ANSI (US), DIN (Germany), or BSI (UK) also sell the standard in PDF format. Iso 14617-3 Pdf