Installed Total Impulse : The combined total impulse of all rocket motors installed in a rocket and intended to be ignited during the launch and flight of the rocket
NFPA 1127 Code for High Power Rocketry, 2008 ed. www.loyola.edu/~/media/department/ehs/.../nfpa%20c ode%20list.ashx, (Code: High Pwr Rocketry - Amer) {381 NFC}