Details

Prefix[expr,h,precedence,grouping] can be used to specify how the output form should be parenthesized.
The special input form f@expr is directly interpreted as f[expr] and does not involve Prefix. »

Examples

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Display f[x] in prefix form:

Use a special character as a prefix operator:

The output from Prefix contains invisible tagging that preserves its meaning:

Copying the output and using it in a input cell produces the same result:

Typing in a visually identical result from scratch will produce a different result:

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