Post History

Before [Iswar Chandra Vidyasagar](https://en.wikipedia.org/wiki/Ishwar_Chandra_Vidyasagar), there was 16 letters in Bengali. Latter, Iswar Chandra said there's no use of ৡ and ৠ for long time. Even, every word could be pronounced without these letters অ০, অঃ. So he removed these four letters. 

Pronunciation :

>ৠ it is pronounced like Rii. Same as ঋ. But that is long while ঋ is short. 

>ৡ it's pronounced like Lii. Nowadays we use ল্লি. And ঌ	is Li. Long and short letters respectively. But ঌ	is pronounced different from লি. আধুলী it was looking like আধু৯ called Adhuli. ল্লি can't be pronounced without any letter before it. পল্লী becomes পৡ called Polli. 

They are changed with ল and ই-কার. Iswar Chandra didn't remove the letter ঌ (Li). But nowadays it's not used anymore also.

>>[![enter image description here][1]][1]

References :

1. https://bn.wikipedia.org/wiki/%E0%A7%A1
2. https://bn.wikipedia.org/wiki/%E0%A6%AC%E0%A6%BE%E0%A6%82%E0%A6%B2%E0%A6%BE_%E0%A6%AC%E0%A6%B0%E0%A7%8D%E0%A6%A3%E0%A6%AE%E0%A6%BE%E0%A6%B2%E0%A6%BE%E0%A6%B0_%E0%A6%87%E0%A6%A4%E0%A6%BF%E0%A6%B9%E0%A6%BE%E0%A6%B8
3. https://www.quora.com/Why-were-the-Bangla-letters-%E0%A6%8C-and-%E0%A7%A1-and-the-diacritics-%E0%A7%A2-and-%E0%A7%A3-made-and-how-do-I-use-them-and-why-arent-they-used-any-longer?share=1

For reading :

1. [বর্ণপরিচয় (Barna Poricoy)](https://bn.wikipedia.org/wiki/%E0%A6%AC%E0%A6%B0%E0%A7%8D%E0%A6%A3%E0%A6%AA%E0%A6%B0%E0%A6%BF%E0%A6%9A%E0%A6%AF%E0%A6%BC) a book by Iswar Chandra Vidyasagar where he described all the phenomenon of Bangla letters.

  [1]: https://i.stack.imgur.com/OBJnw.png