vertical Charlie
upward charlie
- second normal form
- secondo
- second of a kind
- second of arc
- second officer
- second opinion
- second order
- second-order balanced truncation
- second-order blind identification
- second-order climatological station
- second-order closed loop
- second-order closure integrated puff
- second order closure turbulence model
- second order conditioning
- second-order conditioning
- second-order cone
- second-order cone programming
- second order constructs
- second-order correlated localized orbital
- second order cyclic statistics
- second-order difference
- second-order distorted wave
- second-order distorted-wave born
- second-order equation
- second-order extended exact transfer function