A more thorough explanation:

NON PROCEDENDO AD ASSISAM

Non procedendo ad assisam is a legal term that means "of not proceeding to take an assize." It refers to a writ that orders justices not to hold an assize in a particular case.

For example, if a landowner believes that someone else is claiming ownership of their land, they may request a non procedendo ad assisam writ to prevent the justices from holding an assize to determine the ownership of the land.

Another example is if a defendant believes that an assize would not be fair or just in their case, they may request a non procedendo ad assisam writ to prevent the justices from holding an assize.

The examples illustrate how a non procedendo ad assisam writ can be used to prevent an assize from being held in a particular case. This writ is used when a party believes that an assize would not be fair or just, or when they want to prevent the justices from determining the ownership of land. By requesting this writ, the party can stop the assize from taking place and seek other legal remedies.