Massive documentation projects that took me hours to produce and refine. Illustrations included which were even more difficult than the text.
Stolen by my "so called" director who put her own copyright on my stuff ... just because I worked there.
Intellectual property is work or invention derived from creativity like manuscripts or designs to which rights may be applied via patent, copyright, trademarks and so forth ...
Today is World Intellectual Property Day.
Observed each year it is meant to raise awareness of how protection mechanisms like patents, trademarks, copyrights, and such are valuable additions to society and the creation of properties which are more abstract than might be usual in the workplace.
People will rob you blind when they think they own you.