Computerhackers

3 clues
Cybermenaces
On-line menaces
Web concerns ... and based on six familiar names hidden in rows 1, 4, 12 and 15 of this puzzle grid, what the black squares in those rows symbolize
Similar answers:
Acomputer
Acomputerdateis
Analogcomputer
Analogcomputers
Applecomputer
Applecomputers
Bootedthecomputer
Cobolcomputerlanguage
Compute
Computed
Computeitsarea
Computer
Computeranalyst
Computerapse
Computerator
Computerbug
Computerbus
Computerchip
Computerchips
Computercode