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The reflection coefficient (in circuits, for example) is generally given the symbol Gamma (\$\Gamma\$). What is the symbol given for the pass or transmission coefficient \$1-\Gamma\$?

I've usually just seen it written out in terms of \$\Gamma\$ but I'm trying to be more concise in my notation.

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    \$\begingroup\$ the more obvious notation is to use the scattering matrix subscripts, \$s_{21}\$ forward output to port 2 \$\endgroup\$
    – D.A.S.
    Commented Apr 30, 2021 at 1:51

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Variously:

$$ \begin{aligned} Reflection\ coefficient&=R,\ \ \Gamma\\\\ Transmission\ coefficient&=Τ,\ \ τ\\\\ Absorption\ coefficient&=K,\ \ \alpha,\ \ \varepsilon,\ \ \mu \end{aligned} $$

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  • \$\begingroup\$ I'm working with optical couplers which generally already use \$\tau\$, but 'T' may work as well. \$\endgroup\$
    – nate
    Commented Apr 30, 2021 at 2:06

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