Various meanings of Ka, Kb etc

A little while back, I introduced the feature to mhchem to properly format $K$ constant variables, like `$\ce{Ka}$` rendering as $K\_\mathrm{a}$, `$\ce{pKb}$` rendering as $\mathrm{p}K\_\mathrm{b}$, etc. (besides `$\ce{K_a}$` and `$\ce{pK_b}$`).


I was inspired by seeing quite some usage of `Ka`, `pKb` inside `\ce`, here at Chemisty.SE. I also checked if there were other meanings of these terms and found none.


But now, I am getting doubts how future-proof this is. What if the next new chemical element's name will have the 'Ka' abbreviation? What if some field will invent the 'Ka' 'nickname'?


Do you know any other meaning of Ka, Kb, Kw, Kf, Kc, Kp, Ka1, Ka2, Ka3, Kb1, Kb2, Kb3, Keq, Ksp other than $K$ constants?
How likely is it that alternative meanings for these will emerge?


Or, to phrase it differently: How likely is it (or will it be) that somebody typing `\ce{Ka}`, `\ce{Keq}`, ... does intend other output than $K\_\mathrm{a}$, $K\_\mathrm{eq}$, ...?


