These are other items that don't quite fit into the other categories.
Cross-domain tracking has changed drastically with the new client ID and the way links are decorated. It is highly suggested you read up on Universal Analytics' cross-domain tracking. This guide will likely be updated to include this at a later date.
This allows you to time how long it takes for users to do or see something on your site, measured in milliseconds.
Anonymizes the information sent to Google Analytics by removing the last octet of the IP address prior to its storage.
You can also anonymize for a single hit in analytics.js.