What the heck does that mean?

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	For many years, when you went to purchase a fly line, you would find them packaged in a square box that had a label on the outside with the 3 part line classification code.  The first designation code is the "line taper"; the second code is the "line weight"; the 3rd/last code is "line buoyancy".  So, you could find a fly line box labeled, "WF-6-F".  Here's what each of the 3 codes means.
"WF" describes the taper		"6" refers to the line weight		"F" refers to buoyancy
taper codes	meaning	weight codes	meaning	buoyancy codes	meaning
WF	weight forward	1 wt.	one weight	F	floating line
DT	double taper	2 wt.	two weight	S *	sinking line
ST	shooting taper	3 wt.	three weight	F/S *	sinking tip line
RT	rocket taper	etc.,	etc.,
SWT	saltwater taper	up to	the maximum
BBT	bass bug taper	15 weight	fly line
*      Previous topic  As fly lines evolve, we see more Species specific fly fishing: