Nomenclature Guidelines

In This Section

Defining Symbols

Manuscripts with many symbols may benefit from a nomenclature list that defines all symbols at the beginning of the manuscript, inserted between the abstract and the introduction. If one is used, it must contain all the symbology used in the manuscript, and the definitions should not be repeated in the text. The nomenclature is not intended to serve as a glossary of terms, nor does it include definitions for acronyms or abbreviations, which should be defined in the text where they are first used. Abbreviations for standard units of measure never need to be defined.

Style and Format

Nomenclature entries are listed alphabetically (capital letters before lowercase), in the following order: regular letters, Greek letters, numerals, and special symbols. Units of measure should be included in definitions where appropriate. Individual headings may be used to distinguish subscripts and superscripts from regular symbols. Follow AIAA formatting and typeface rules with respect to the use of italics, bold, or regular type.

Sample Nomenclature
A=amplitude of oscillation
ai, aj=measurement coordinates for ith and jth controllers
Cy=force coefficient in the y direction
cp=specific heat at constant pressure
dt=time step
Fx=X component of the resultant pressure force acting on the vehicle
Fy=Y component of the resultant pressure force acting on the vehicle
f, g=generic functions
h=height, m
i=time index during navigation
p=Laplace variable, σ + 
t=time, s
Wav=average molecular weight of gas
X0=initial axial velocity
Θ=boundary-layer momentum thickness


cg=center of gravity
G=generator body
iso=waypoint index