"I made some entries in my tablettes this morning"
Ancient greek man with wax tablet
Public DomainAncient greek man with wax tablet - Credit: Painting by ancient greek painter Douris (about 500 BC)

A wax tablet is a tablet made of wood and covered with a layer of wax, often linked loosely to a cover tablet. It was used as a reusable and portable writing surface in Antiquity and throughout the Middle Ages. 

Writing on the wax surface was performed with a stylus.  A straight-edged, spatula-like implement served as an eraser. The entire tablet could be cleared for reuse by warming it to about 50°C and smoothing the softened wax surface.

Wax tablets were used for a variety of purposes, from taking down notes to recording business accounts. They continued to be used for high-volume business records of transient importance until the 19th century.