Are nil and null interchangeable? For example,
My bank a/c has a nil balance.
My bank a/c has a null balance.
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NULL is used in computing most often (always?) to signify "not a value." This is different than zero: in a bank database, a zero value means no money, while a NULL value means there has been no value assigned to the balance.
This is a specialized usage, but increasingly common as more people learn to program.
Null is also used in physics and electronics. Here's a description of a Null comparator using a Wheatstone bridge. Null tends to describe something with no net value, but possibly the sum of large values of opposing signs, while nil implies a value of 0.