In any case, the things they added could very well have been called "column-divider" and "row-divider" with much less ambiguity because not everyone who has to wrangle with CSS is a designer by profession or by choice.
> A ruler, sometimes called a rule, scale or a line gauge or metre/meter stick, is an instrument used to make length measurements, whereby a length is read from a series of markings called "rules" along an edge of the device.
- there is a decision on how to measure things ( this affects prices taxes and commerce )
- there is an association between the power to enforce a standard and the instruments of that standard
- the measure instruments are generally very straight
