A position on a phenyl ring - see ortho.

(IP Security Option) That part of the Internet Protocol that defines security levels on a per-interface basis.

IP Security Option. U.S. government specification that defines an optional field in the IP packet header that defines hierarchical packet security levels on a per interface basis.

a unique real-time, multi-user, multi-level project management tool with critical path project planning, time-recording, document and resource management functions