Gualdhar

Sorry for a possibly newbie question, but I'm trying to build the Capacitance Meter listed at http://www.electronics-lab.com/projects/test/006/index.html and I'm wondering about the symbol for the 47k, 470, and one of the 10k resistors. It has a resistor with something that looks like maybe a feedback loop? I can't tell what it is or how to build it, and could use some assistance. Thanks in advance.