53 - Deprecated keywords

Use of deprecated functions/operators such as:

block.blockhash() for blockhash()
msg.gas for gasleft()
throw for revert()
sha3() for keccak256()
callcode() for delegatecall()
suicide() for selfdestruct()
constant for view
var for actual type name

These should be avoided to prevent unintended errors with newer compiler versions. (see here)

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Deprecated Keywords
E.g.: msg.gas, throw, sha3, constant, var etc.
Compiler Warnings -> Errors
Avoid Deprecated Keywords

References

Youtube Reference

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