The syntax of the
Mathematica language is unique among modern languages in allowing not just ordinary ASCII characters, but also a variety of special characters that greatly increase readability and elegance, as well as correspondence with traditional mathematical notation.
× \[Times] — multiplication sign, automatically added between numbers etc.
≠,
≤,
≥,
= — automatically converted from

,

,

,

\[LongEqual] — alternative form equivalent to

→ \[Rule] — automatically converted from

⧴ \[RuleDelayed] — automatically converted from

...
...
— part specification, entered using
Esc [[ Esc,
Esc ]] Esc
\[InvisibleApplication] — separate a function and its argument, as in
