The "Sol Salute"

The "Sol Salute", also known as an R7, is a hand gesture in which the gesturer wraps their pointer and middle finger around each other, touches the ring finger to the thumb, lets the pinkie finger stand out, and forms a v with the whole hand. This gesture is largely considered to be offensive, and not to be used in polite company.

History
The "Sol Salute" aka "Flipping the Terran" originated on Old Earth in very ancient times. The first known reference was in an ancient Brewtanian Document dated at around 7,000 BC.

Use
As the gesture signifies rejection, the offense level intended is measured by the manner in which the gesture is delivered.
 * A casual brushoff with the gesture can simply be taken as "Busy," "not now," or "not interested."
 * A flick towards someone indicates rejection of them specifically in that moment, and can be used in moments of heated anger that the gesturer recognizes may pass eventually.
 * To make the Sol salute and make a sweeping head-to-toe motion indicates a complete and permanent rejection of the person and everything that makes them who they are. This is the most offensive gesture known to HILT, and there is no proper response to it other than to wage constant terrible war against them.