okay, now I'm feeling silly, but I have no idea what 2K2 means, in the context of a resistor. (or 2M2, for that matter) at http://www.uoguelph.ca/~antoon/gadgets/555ex6.gif, (no, I _do_ like the 555, and I need the practice), the very upper left hand resistor says 2K2 for it's value. What's this mean? many thanks.