* काला पट्टा (kala patta): This is the most common and direct translation, meaning "black board".
* श्यामपट्ट (shyaampatta): This is a more formal term, also meaning "black board".
* चॉकबोर्ड (chokboard): This is a loanword from English, but it is also widely used in Hindi.
The best choice depends on the context. For example, in a casual setting, you could use "kala patta". In a formal setting, "shyaampatta" might be more appropriate. "Chokboard" is also acceptable in most contexts.