# Formula Symbols - O

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

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 SymbolDefinitionUSMetric
$$ON$$ - octane number - -
$$x$$ - offset distance $$ft$$ $$m$$
$$R$$ - ohm - -
$$Oh$$ - Ohnesorge Number Dimensionless Number Dimensionless Number
$$\Omega$$ omega ohm - -
$$L \;,\; l_i$$ - orbital angular momentum - -
$$n$$ - order of reflexion - -
$$K$$ - orifice constant $$gpm- \sqrt {psi}$$ $$L \;/\; s \sqrt {kPa}$$
$$g \;,\; \phi$$ phi osmotic coefficient - -
$$\Pi \;,\; \pi$$ Pi , pi osmotic pressure $$lbf\;/\;ft^2$$ $$Pa$$
$$p_o$$ - outlet pressure $$lbf\;/\;ft^2$$ $$Pa$$
$$U$$ - overall coefficient of heat transfer $$Btu \;/\; ft^2 - hr - ^\circ F$$ $$W \;/\; m^2 \cdot K$$