# Syntax for the convergence of arbitrary variables

Can any person clarify the syntax from the adhering to Wikipedia write-up on the convergence of random variables?

Specifically:

1. What is the squiggly line?
2. What are $d$, $D$, $L$, $L_X$?
3. Why does it claim $X_n$ indicates X? They do not appear to be declarations
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2019-05-04 17:50:03
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All of these expressions are simply symbols for "X_n merges to $X$ in circulation".
2. The icons $d$ and also $\mathcal D$ represent circulation , $\mathcal L$ and also $\mathcal L_X$ represent regulation . (One additionally mentions "merging in regulation" as opposed to "merging in circulation".