International Mother Language Day
Bengali alphabet (বাংলা বর্ণমালা)
The Bengali script or Bangla alphabet (Bengali: বাংলা বর্ণমালা, Bangla bôrṇômala) is the alphabet used to write the Bengali language based on the Bengali-Assamese script, and has historically been used to write Sanskrit within Bengal. It is one of the most widely adopted writing systems in the world (used by over 265 million people).

There are a total of 50 letters, 11 vowels (স্বরবর্ণ) and 39 consonants (ব্যঞ্জনবর্ণ).
Vowels (স্বরবর্ণ)
অ, আ, ই, ঈ, উ, ঊ, ঋ, এ, ঐ, ও, ঔ
Consonants (ব্যঞ্জনবর্ণ)
ক, খ, গ, ঘ, ঙ,
চ, ছ, জ, ঝ, ঞ,
ট, ঠ, ড, ঢ, ণ,
ত, থ, দ, ধ, ন,
প, ফ, ব, ভ, ম,
য, র, ল, শ, ষ,
স, হ, ড়, ঢ়, য়,
ৎ, ং, ঃ, ঁ

ref.
https://en.wikipedia.org/wiki/Bengali_alphabet
https://en.wikipedia.org/wiki/International_Mother_Language_Day
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