or ϖ) is a glyph variant of lowercase pi sometimes used in technical contexts.
It resembles a lowercase omega with a macron, though historically it is simply a cursive form of pi, with its legs bent inward to meet.
It is a symbol for: Lower-case pi was fairly common in 8-bit character encodings, for instance it is at 0xE3 in CP437 and at 0xB9 on Mac OS Roman.
The various forms of pi present in Unicode are: These are intended for use as mathematical symbols.
Using the mathematical symbols to display words (or vice versa) is likely to result in inconsistent spacing and a clumsy, mismatched appearance: