The review of the system to learn as much as possible about the organization, its systems, and networks is known as

Reconnaissance

Explanation:

Reconnaissance is type of cyber attack in which an intruder/tester interact with a targeted system so as to learn as much as possible about the organization, its systems, and networks.

Reconnaissance  can either passive or active.

In passive reconnaissance the attacker is not actively engage with the system while in active reconnaissance the attacker is actively engage with the system.

do not use any of these common illegal characters/symbols:

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% percent

& ampersand

{ left curly bracket

} right curly bracket

\ back slash

< left angle bracket

> right angle bracket

* asterisk

? question mark

/ forward slash

  blank spaces

$ dollar sign

! exclamation point

' single quotes

" double quotes

: colon

@ at sign