At the end of Gattaca, before Vincent heads to his flight, Jerome shows him a whole lot of samples and says that he's going on a "journey" himself. He gives Vincent an envelope not to open before he's up in space. When Vincent then finally starts his journey to Titan, Jerome puts on his silver medal and then commits suicide in the incinerator. And when Vincent opens the envelope he finds a tuft of hair, most probably Jerome's.
But I wonder what Jerome wanted to say with this envelope. Was this his way of telling Vincent that he commited suicide? If yes, then how is this to be deduced from a tuft of his hair? If not, what other message did he want to convey this way?