Trespass is an area of tort law broadly divided into three groups: trespass to the person, trespass to chattels, and trespass to land.
Denning LJ: "[I]n an ordinary fight with fists there is no cause of action to either of [the combatants] for any injury suffered."
Posted sign in the United States, prohibiting any form of trespass be it for hunting, fishing, trapping or any other purpose
No trespassing lawn signs are common in many countries
William O. Douglas stated: "the flight of airplanes, which skim the surface but do not touch it, is as much an appropriation of the use of the land as a more conventional entry upon it."
Cuius est solum, eius est usque ad coelum et ad inferos
Cuius est solum, eius est usque ad coelum et ad inferos is a principle of property law, stating that property holders have rights not only to the plot of land itself, but also the air above and the ground below. The principle is often referred to in its abbreviated form as the ad coelum doctrine.
At common law, property owners held title to all resources located above, below, or upon their land