“Ad’dhad” modern coasters from WASF celebrate Arabic Language with its differentiating phonology. It introduces Arabic ‘s extremely unusual sound letter ض  ḍād . Arabic grammarians describe Arabic language as the لغة الضاد lughat aḍ-ḍād "the language of ḍād", since the sound was thought to be unique to Arabic. 
We chose with this coasters collection the emphasizing Shadda & the Dhamma:
 -Dhamma ضَمَّة is a small curl-like diacritic placed above a letter to represent a short “u”. For example: ضُ  du.
 -Shadda شَدَّة shaped like a small written Latin “w". It is used to indicate emphasis or extra length when written above the consonant to be doubled.
Each set of 2 coasters comes in either stainless steel or brass, polished or brushed finish.