yes i agree. the arrow on the source indicates the source (if transistor is used in unusual 'analog' configurations, and if the device (like drain-extended ones) is non symmetrical), while the circle on the gate indicates the channel type. What i should remove are the 'D,G,S,B' names on the symbol terminals since they are obvious . Anyway they are on a separate graphic layer, so they can be (globally) disabled at wish.