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What does the letter do ৡ in Bangla?

There are 14 অ বর্গীয় (O borgiyo) letters in Bengali. But couldn't find out in book what they are. I know that there are 11 vowel letters in Bengali. But while looking for অ বর্গীয়, I just found that there are 14 vowel letters<sup>[English Wikipedia](https://en.wikipedia.org/wiki/Bengali_alphabet#Characters) [Bangla Wikipedia](https://bn.wikipedia.org/wiki/%E0%A6%AC%E0%A6%BE%E0%A6%82%E0%A6%B2%E0%A6%BE_%E0%A6%B2%E0%A6%BF%E0%A6%AA%E0%A6%BF#%E0%A6%AC%E0%A6%BE%E0%A6%82%E0%A6%B2%E0%A6%BE_%E0%A6%85%E0%A6%95%E0%A7%8D%E0%A6%B7%E0%A6%B0)</sup>. I suspect they are referring to অ বর্গীয়. Since their numbers are equal and every single book in Bangla says that there are 11 vowel letters.
In Wikipedia, I found a new letter ৡ. It is called দীর্ঘ ঌ according to Bangla Wikipedia (Unicode can't be detected in English Wikipedia properly). What does it mean? Even I haven't seen anyone using the letter. There was another similar letter which is ঌ. Generally, It is equivalent to "9" in English. But, the Bangla Wikipedia call it হ্রস্ব ঌ. Even I have never seen these kind of conjunctive earlier.
how do these letters work in Bangla? I wonder why there's no Bengali tag.

There are 14 অ বর্গীয় (O borgiyo) letters in Bengali. But couldn't find out in book what they are. I know that there are 11 vowel letters in Bengali. But while looking for অ বর্গীয়, I just found that there are 14 vowel letters<sup>[English Wikipedia](https://en.wikipedia.org/wiki/Bengali_alphabet#Characters) [Bangla Wikipedia](https://bn.wikipedia.org/wiki/%E0%A6%AC%E0%A6%BE%E0%A6%82%E0%A6%B2%E0%A6%BE_%E0%A6%B2%E0%A6%BF%E0%A6%AA%E0%A6%BF#%E0%A6%AC%E0%A6%BE%E0%A6%82%E0%A6%B2%E0%A6%BE_%E0%A6%85%E0%A6%95%E0%A7%8D%E0%A6%B7%E0%A6%B0)</sup>. I suspect they are referring to অ বর্গীয়. Since their numbers are equal and every single book in Bangla says that there are 11 vowel letters.
In Wikipedia, I found a new letter ৡ. It is called দীর্ঘ ঌ according to Bangla Wikipedia (Unicode can't be detected in English Wikipedia properly). What does it mean? Even I haven't seen anyone using the letter. There was another similar letter which is ঌ. Generally, It is equivalent to "9" in English. But, the Bangla Wikipedia call it হ্রস্ব ঌ. Even I have never seen these kind of conjunctive earlier.
How do these letters work in Bangla?

Bengali