Structural element with built-in meaning.
\[InvisibleApplication] is by default not visible on display, but is interpreted as function application.
f @ x is interpreted as f @ x or f[x].
\[InvisibleApplication] can be used as an invisible separator between functions or between functions and their arguments.
See The Mathematica Book: Section 1.10.4 and Section 3.10.5.
See also: \[InvisibleSpace] , \[InvisibleComma] , \[RawAt] .
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