# Formula Symbols - O

Written by Jerry Ratzlaff on . Posted in Nomenclature & Symbols for Engineering, Mathematics, and Science

## Formula Symbols - O

For other symbols see:  A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z

SymbolGreek SymbolDefinitionUSMetricValue
$$\rho_o$$ rho object density $$lb\;/\;ft^3$$ $$kg\;/\;m^3$$ -
$$ON$$ - octane number - - -
$$x$$ - offset distance $$ft$$ $$m$$ -
$$T$$ - offset motion - - -
$$R$$ - ohm - - -
$$Oh$$ - Ohnesorge number Dimensionless Dimensionless -
$$\Omega$$ omega ohm - - -
$$L$$, $$\;l_i$$ - orbital angular momentum - - -
$$n$$ - order of reflexion - - -
$$K$$ - orifice constant $$gpm- \sqrt {psi}$$ $$L \;/\; s \sqrt {kPa}$$ -
$$l_o$$ - origional length $$ft$$ \;or\; $$m$$ $$in$$ \;or\; $$mm$$ -
$$g$$, $$\;\phi$$ phi osmotic coefficient - - -
$$\Pi$$, $$\;\pi$$ Pi, pi osmotic pressure $$lbf\;/\;ft^2$$ $$Pa$$ -
$$p_o$$ - outlet pressure $$lbf\;/\;ft^2$$ $$Pa$$ -
$$E_o$$ - output energy $$ft\;-\;lbf$$ $$J$$ -
$$W_o$$ - output work $$ft\;-\;lbf$$ $$J$$ -
$$OD$$ - outside diameter $$in$$ $$mm$$ -
$$U$$ - overall coefficient of heat transfer $$Btu \;/\; ft^2 - hr - F$$ $$W \;/\; m^2-K$$ -