See also the barrier category.
Page 30, Column 1, Paragraph(s) 15, Core Rule Book
Barrier: One of the four subtypes of ice which the Corporation can use to defend his servers.

Barrier is one of the four main subtypes of ice that the Corporation uses to protect his/her servers. Barriers are generally characterized by pure stopping power, with lots of "end the run" subroutines and fairly efficient rez/strength ratios. They are broken by fracters.

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