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FUV is a logical format. The standard setting is NFUV (false).

FUV tells CL to print a special footnote on each page where CUV, the character for undefined value, is printed.

Formats FAZ, FNZ and FUV work in conjunction. CL prints all footnotes requested by these formats on a single line.

See also format:

FAZ Footnote for Absolute Zeros

FNZ Footnote for Nearly Zeros