(Not research-level, but perhaps not easily answered elsewhere — you decide if MO can afford the innocent fun. If so, it should likely be “community-wiki” i.e. one object per answer.)
I am seeking examples of objects that, in context, eat out name-space because either:
their name literally is a single letter (e.g., in calculus, $ e$ ); or
they are denoted so inflexibly that a letter gets frozen out (e.g., in group theory, $ e$ ).
Also welcome: comments on how such (usually poor) practice came about; successful strategies to reclaim the alphabet — e.g., write $ \mathrm e$ ; say abscissa and ordinate, not $ x$ and $ y$ ; or any good story.
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