Definition:Fourier Transform/Also denoted as

Fourier Transform: Also denoted as
The Fourier transform of $f$ is also occasionally seen denoted by $\hat f$, but this is not endorsed on.

The style of $\FF$ can vary across different sources. uses $\FF$ as standard.

Some sources write $\FF \sqbrk f$ instead of $\map \FF f$.

Some sources omit the brackets altogether, and deploy it as $\FF f$.