In Jainism, "Porisi" refers to a traditional unit of measurement used in ancient Jain texts, especially in reference to the human body or objects. It is often mentioned while describing the size or height of Tirthankaras or other important figures in Jain scriptures.

For example, the height of Lord Rishabhanatha (the first Tirthankara) is described in terms of porisi in Jain texts. The exact length of a porisi can vary based on the context, but it is generally considered to be a measurement based on the human body, similar to the concept of a "cubit" or the length of the forearm from the elbow to the fingertip.

Porisi is one of several traditional Jain measurements such as yojana, dhanusha, angula, and so on, which are used to describe distances, heights, and other dimensions in Jain literature.