<p>I have had this show up for a while, but have always forgotten to ask about it. I have a ti-89, and when I so solve, usually when using trig functions, I occasionally get a symbol in the answer that I'm not sure the meaning of. </p>
<p>It looks like an ln, but the l has a very rounded top, almost like a P. It is then followed by a number with many decimals, and then a pi. Does this just mean it's a number very close to the number before it? And can I just ignore it?</p>