If this is related to tax requests (like Form 16B), you must log in to the official TRACES portal to submit a "Requested Download".

While a single "official" definition for this exact alphanumeric code is not universal, it appears in several specialized fields:

"PTC" frequently refers to Postal Training Centres (e.g., PTC Mysore), which release digital "Ready Reckoners" and induction materials for staff.

Codes like "NTAB" are sometimes used in specific departmental database tags for training modules or internal requests. 🛡️ Safe Ways to Obtain Similar Resources

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PTC is also a major software company (known for Creo and ThingWorx) that hosts a large developer community and technical downloads.