Returns lowercased string or synbol.

Syntax: .o.lower x; .o.lower[x]

o).o.lower "A"
o).o.lower `TEST

If some chars requires special considerations (e.g. multiple chars) they given by SpecialCasing.txt

o).o.lower "SS"
o).o.lower "É"

This operation performs an unconditional mapping without tailoring. That is, the conversion is independent of context and language.

In the Unicode Standard, Chapter 4 (Character Properties) discusses case mapping in general and Chapter 3 (Conformance) discusses the default algorithm for case conversion.