What are those terms on the Electricity Meter?

Most of us have been paying our electricity bills month after month for years, but has anyone ever taken a close look at the electricity meter just outside our home?

What do those terms and parameters mean? What is Email Metering? What are "FL", "F" and "S", do they represent Flow, Fast and Slow?

How do we know if the meter has been properly calibrated? How often are they calibrated because most equipment need to be calibrated on a regular basis to ensure conformance to certain standards? Are they calibrated according to the housing type, which seems to be a criterion used for most business and financial calculations? Why do some households claim that their bills are consistently high despite little consumption? Is it because it is not calibrated or recalibrated?