* The "helix,"[25] as it is referred to by the writers, is a symbol that first appears on the right shoulder blade of Niki Sanders/Jessica in episode Collision, and is seen on the sword hilt in the episode "Godsend." Writer and co-producer Aron Coleite has stated that it literally means "God sending great ability."[25] The symbol frequently appears as a pattern formed by mundane objects, but it also recurs on certain plot-significant items and on several characters.

    * A mark consisting of two black parallel lines has been shown close to the neck of multiple super-powered characters. The mark is the scar left by the two-pronged needle of a pneumatic injection device,[26][27] which, as revealed in a biography of Hana Gitelman in the Heroes 360 experience, injects a radioisotope to allow tracking.[28]

    * At the end of Season 1, a virus is revealed that targets those with powers. It is neurological and interferes with the user's powers. The Company has hired Mohinder Suresh to find a cure. Currently the antibodies in his blood are the only cure. Starting with episode 7, the virus becomes the central plot element to the second season. After Peter and Caitlin are taken into the future (2008), they find that 93% of the world's population has been wiped out by the mysterious virus.

    * In addition to being the series logo, a solar eclipse has been a recurring image in the series itself. A terrestrial eclipse (an eclipse in which the Earth covers the Sun, as viewed from some observation point away from the Earth) is used in the series' title sequence.

    * Cockroaches have appeared and have been mentioned several times in the series. Also, the cockroaches always seem to be near Sylar.

    * Activating Evolution is a book written by Chandra Suresh. It describes Suresh's discoveries and predictions about the emergence of humans evolved with special abilities.





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