marks on the walls

[English4everyone]

Sometimes prisoners put some marks on the walls of the prison to keep count of the days. Is there a name for that mark?

[emsr2d2]

Sometimes prisoners put some marks on the walls of the prison to keep count of the days. Is there a name for that mark?

It's called a tally mark.
If it's four vertical lines crossed with a horizontal fifth line, then each set of five lines is called a five-bar gate.