Various
TSE - Turkish Standards Institution - Turkish Standards Institute, was established in 1960 and is solely responsible for all standards in Turkey. The Institute is a member of international standardization organizations such as ISO, IEC, CEN and others

TSE web site https://en.tse.org.tr/

An example of a cover that carries the standard on the "ultimate manhole covers" site. From this lid the picture that appears in the general section was taken.
There are 6 manhole covers in the site that has this standard mark
Click for all the covers with this standard

Click for the rest of the standards in the site

The ultimate manhole covers site

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