Good Till Cancel Order. Usually associated with limit Orders for Set Positions. For Example 2,500,000 Sell @ .18 PPS GTC. Depending on Broker these usually only last approximately 2 months so you will have to renew the GTC Sell at the PPS you want to get out ever 2 months or so with the exception that your order gets filled and you cash out your shares at the preset pps. Hope that helps.