Which measurement symbol is this?

PLS HELP ME​

What is the first step in creating a maintenance ?

It policy compliance and emerging technologies respond to the following: propose at least three control measures that organizations need to put in place to ensure that they remain complaint with emerging technologies and in a continually changing it environment. examine the correlation of effective configuration management and change control procedures to remain compliant with emerging technologies and it security changes.

Is an attack that relies on guessing the isns of tcp packets