The semaphore of Delta and November: Semaphore signal for the letter N (green) + semaphore signal for the letter D (blue), forming the symbol of Nuclear Disarmanent: "ND". Based on the diagrams at http://www.anbg.gov.au/flags/semaphore.html.
This file was derived from:

 Semaphore Delta.svg: 
Semaphore November.svg:
Semaphore_Delta.svg: User:Denelson83
Semaphore_November.svg: User:Denelson83
derivative work: Wwbread (talk)