The 2021 update introduces symbols for:
| Aspect | 2002 version | 2021 version | |--------|--------------|---------------| | | Good | Improved for digital use | | New symbols | Missing some modern connectors | Added symbols for fiber optics, wireless, and advanced bus systems | | Terminology | Legacy terms | Aligned with IEC 81346 and ISO 81714 | | Layout rules | Basic | More detailed rules for scalable diagrams | iso 146173 pdf updated
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