|
|
|
|
|
|
The quarter (lit. "one-fourth") is used as the name of several distinct English units based on ¼ sizes of some base unit.
The French scale or French gauge system is commonly used to measure the size of a catheter. It is most often abbreviated as Fr, but can often be seen abbreviated as Fg, Ga, FR or F. It may also be abbreviated as CH or Ch (for Charrière, its inventor).