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(nasm.info)Section 2.2.1

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2.2.1. NASM Is Case-Sensitive
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   One simple difference is that NASM is case-sensitive. It makes a
difference whether you call your label `foo', `Foo' or `FOO'. If you're
assembling to `DOS' or `OS/2' `.OBJ' files, you can invoke the
`UPPERCASE' directive (documented in *Note Section 6.2::) to ensure
that all symbols exported to other code modules are forced to be upper
case; but even then, _within_ a single module, NASM will distinguish
between labels differing only in case.