5R2

5R2 is a code that can refer to different things depending on context. It is best known in electronics as a marking for a specific resistance value, but it also appears as a model or part-number code in various industries. Because it is an alphanumeric string rather than a standard name, its meaning is determined by accompanying documentation or marking.

In electronics, 5R2 denotes a resistance value of 5.2 ohms. The R stands for decimal point and is used on resistors to avoid misreading the decimal. This convention is used on through-hole and surface-mount components; other common examples include 1R0 (1 ohm) and 10R0 (10 ohms). The tolerance and wattage are not fixed by the code alone and must be taken from the part's datasheet or marking set.

Beyond resistors, 5R2 can be a catalog, model, or batch identifier in manufacturing, or appear in other technical contexts as a shorthand that requires additional specification. Without context, the term does not denote a single universally recognized topic.