Booklet : A small book that may contain single or blocks of stamps, made for convenience of use.
Coil: A roll of stamps, used for the dispensing of stamps, sometimes called 'Counter coil'
Cracked plate: The plates used in the printing process being made of metal are prone to developing cracks, this results in hair line irregular marks appearing on the stamps.
Mesh : The grain of paper, of desribed as being 'Vertical' or 'Horizontal' that is the direction the grain lies when the stamp is being examined.
Oxidised :The effect of Sulphide gases on stamp colours (those that contain lead) which leads to distinct colour changes. In New Zealand very common in thermal areas such as Rotorua.