Reference designators

Reference designators can refer to standard labeling in anything - like construction, industry, power plants (see e.g. IEC 81346).

In this case, we are interested mainly in reference designators in electronics - the labeling on circuit board (silkscreen) that indicate what type of component goes there.

See also:

• https://en.wikipedia.org/wiki/Reference_designator
• https://dexpcb.com/manual/standard-reference-designators.htm