Unicode generator

[distributive]

A command, or perhaps better implemented as a family of commands, that allows users to generate unicode characters that might otherwise be difficult or tedious to find.

Potential examples

Accents

$umlaut e -> ë
$acute e -> é
$grave E -> È
$dipthong ae -> æ
$cedilla c -> ç

Mathematical symbols

$sigma/$Sigma -> σ/Σ
$pi/$Pi -> π/Π
$ne -> ≠
(Note: having each greek symbol might be too much hassle, could do $greek sigma Sigma pi Pi instead)

Misc.

$currency euro -> €

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This isn't supposed to be an exhaustive list, and there's no need to add arbitrary symbols if they won't see use. However, this could be a good beginner issue to implement/extend.