It can include surname, graphic design, product shape, packaging, numbers and letters, etc. Specially designed letters and numbers can be placed in trademarks through color combinations. Not only these, but also some special signs are acceptable, such as:

1.？ Official symbol of Turkey's accession to the Convention.

2.？ A sign of a group or organization with public characteristics.

3.？ Signs on works of art.

4.？ With the consent of the trademark owner, well-known trademarks can also be registered in different categories from their trademarks.