I'm searching for two symbols – considering they exist – (1) unknown value; (2) unknown probability.
Note: I thought that $x$ was used in a temporary context, whenever I see it, it remains unknown until an evaluation is made. I was thinking in a "unknown and impossible to be known" context. I'm not sure if this
context exists or if $x$ also express it.
Best Answer
Generally used Symbol for unknown value is $x$ and other letters.
and
unknown probability of some event $A$ is denoted as $P(A)$ or $P_A$.