This was trained from my dataset: Kaggle | Indian Sign Language Translation Letters n Digits
This dataset has 10 digits and 23 out of the 26 letters of the alphabet.
A CNN was trained on this dataset and an accuracy of 98.14% was observed on unseen test dataset.
Few classes of the dataset had images similar to these:
The model was trained over Kaggle Kernels using NVidia K80 GPU with 16 GB RAM.