Difus is a meaning that is only used as a definition of line pattern.
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DIFOT - DIFR - DIFS - DIFT - DIFU - DIFV - DIFxAPP - DIG - DIGA - DIGAF
"DIFUS." Abbreviations.com. STANDS4 LLC, 2019. Web. 19 Nov. 2019. <https://www.abbreviations.com/DIFUS>.