Nine Inch Nails has had many logos used other the years, and while the original logo is still considered the band's "main" logo, this is a list of all logos that have been used over the years.
Original
Designed by Gary Talpas based on Trent Reznor's concept.
On Tour
A stencil variant used to mark touring cabinets and equipment
Sin
Designed by Talpas
Broken
Designed by Talpas
The Fragile
With Teeth
Designed by Rob Sheridan, based on the Talpas original.
With Teeth Tour
Many tour posters had variations on the Sheridan theme, glitch manipulation of the Talpas logo.
The Slip
Designed by Sheridan, used only on the album booklet.
Hesitation Marks
Add Violence
Bad Witch
Cold Black And Infinite
(tbd)