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$x\in E$ reads "$x$ belongs to $E$".

$X\subset E$ reads "$X$ is contained in $E$".

$E\supset X$ reads "$X$ contains $E$".

$E\ni x$ ????? How am I supposed to read that?

I'm guessing "$E$ owns $x$"?

Xander Henderson
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Luca T. Castrillón
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    Taking a polemic tone, I object to all of your readings. $x\in E$ is "$x$ is an element of $E$"; $X\subseteq E$ is "$X$ is a subset of $E$"; and $E \supseteq X$ is "$E$ is a superset of $X$". While I would rarely write either $E \supset X$ or $E\ni x$, I would probably read the latter as "$E$ contains $x$ as an element". – Xander Henderson Mar 07 '23 at 23:51
  • "$E$ owns $x$": the 13th Amendment prohibits that interpretation. – Golden_Ratio Mar 08 '23 at 00:00

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