Jack, As far as the J & P for connectors most people get this wrong and think its a male/female thing. The correct usage of J & P : J is the stationary half and P is the moving half. Where they both float the receptacle style should be the J or just pick one. As far as male or female pins the Schematic symbol itself is where that is defined; " --> " is male and " --<" is female. Bob Wolfe Inter-Tel Inc. > -----Original Message----- > From: Jack Olson [SMTP:[log in to unmask]] > Sent: Monday, January 10, 2000 1:22 PM > To: [log in to unmask] > Subject: [DC] Reference Designators > > Something I overheard this morning got me wondering... > > Have any of you been around long enough to know why a diode would have a > designator of CR? What does the CR mean? > > What does the U mean on an Integrated Circuit? > > Is the K on relays arbitrary since R is used by resistors? > > Does anyone really use P anymore for plugs? > (everything I've seen lately is J on connectors, no matter if it is a > socket > or a plug) > > What do you use for submodules or subassemblies? > > Not really important, I was just curious.... > > Jack