Beginner Q&A on Stock Market

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What is NIFTY?

NSE Index Fifty

I have two queries -
1- What is upper circuit?

Upper Circuit is the limit (percentage) upto which a share can go high in a particular day.
eg. the UC limit is 5% for STC
so if it is 1000 bucks today. It can go maximum by only 5% or 50 rupees on this day!Ithe share gets locked and no more buying can take place.

2- What is BTST?

Buy today sell tommorrow