Applies to letter and graphical symbols intended for marking on and identifying the function of electromechanical or static a.c. electricity meters and their auxiliary devices.The symbols specified in this standard shall be marked on the name-plate, dial plate, external labels or accessories, or shown on the display of the meter as appropriate. This publication is of high relevance for Smart Grid.

Link

https://webstore.iec.ch/publication/6387

Technology

Smart metering infrastructure

Integrated Grid