gusten: Wait a moment, please - I've got to search a little for a reference, but it seems like there would be kind of conicals in a sense of slimmed sphericals - let me search... *short pause (*)* Yup, there you go: Either scroll down to or use the browser text search for "Spherical Tip on Fine Groove" on Yoshi's page on record specs (
http://www7a.biglobe.ne.jp/~yosh/recspecs.htm). From that it would appear that one could propably use either term with a good reason.
Greetings from Munich!
Manfred / lini
*) hit on the first try - not bad for my good old brain...