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.o.upper

Returns uppercased string or synbol.

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

o).o.upper "a"
"A"
o).o.upper["Qwerty"]
"QWERTY"
o).o.upper `test
`TEST

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

o).o.upper "ß"
"SS"
o).o.upper "Русский военный корабль, иди нах*й!"
"РУССКИЙ ВОЕННЫЙ КОРАБЛЬ, ИДИ НАХ*Й!"
o)

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.