See also the sentry category.
Page 31, Column 2, Paragraph(s) 15, Core Rule Book
Sentry: One of the four subtypes of ice which the Corporation uses to defend his servers.

Sentry is one of the main subtypes of ice the Corporation uses to protect his/her servers. Sentries tend to be the more destructive and damaging of ice, with ice that can trace, tag, and damage the Runner or trash parts of his/her rig. Sentries are broken by killers.

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