Retirement tax questions

Does UNDETERMINED = Unknown?

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UNDETERMINED TERM TRANSACTIONS FOR NONCOVERED TAX LOTS [Ordinary gains or losses are identified in the Additional information column] (Line 5)
Report on Form 8949, Part I with Box B checked or Part II with Box E checked. Basis is NOT provided to the IRS. (Line 12)
“Date acquired,” “Cost or other basis,” "Accrued market discount," "Wash sale loss disallowed" and “Gain or loss (-)” are NOT reported to the IRS.