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In the spirit of the What is a Word™/Phrase™ series started by JLee, a special brand of Phrase™ and Word™ puzzles.

If a word conforms to a special rule, we call it a DD Word™.
Use the examples below to find the rule.

$$ \def\Pad{\P{0.0}} \def\Title{\textbf{ DD }} \def\S#1#2{\Space{#1}{20px}{#2px}}\def\P#1{\V{#1em}}\ \def\V#1{\S{#1}{9}} \def\T{\Title\textbf{Words}^™\Pad}\def\NT{\Pad\textbf{Not}\T\ }\displaystyle \smash{\lower{29px}\bbox[yellow]{\phantom{\rlap{rubio.2017.02.04}\S{6px}{0} \begin{array}{cc}\Pad\T&\NT\\\end{array}}}}\atop\def\V#1{\S{#1}{5}} \begin{array}{|c|c|}\hline\Pad\T&\NT\\\hline \text{JAMJAR}&\text{HONEYPOT}\\\hline \text{NOSTRIL}&\text{SINUS}\\\hline \text{GASOLINE}&\text{PETROLEUM}\\\hline \text{JASPER}&\text{TOPAZ}\\\hline \text{ENDNOTE}&\text{INDEX}\\\hline \text{PONDER}&\text{PERUSE}\\\hline \text{TRAMFUL}&\text{BEWILDER}\\\hline \end{array}$$

What is a DD Word™?

Hint 1:

Time for a hint!

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  • $\begingroup$ rot13(V gubhtug vg jnf N vf 1, O vf 2 rgp naq gur fhz vf bqq sbe QQ jbeqf, ohg gung qbrfa'g tnfbyvar naq crgebyrhz ner gur jebat jnl ebhaq sbe gung naq cbaqre qbrfa'g svg.) $\endgroup$ – marcellothearcane Sep 19 '19 at 20:03
  • $\begingroup$ rot13(Vg'f abg gur ahzrevpny inyhrf bs gur ahzoref nqqrq gb rdhny QQ be 44 orpnhfr wnzwne nqqf hc gb 53) $\endgroup$ – GrumpyLlama59 Sep 19 '19 at 20:13
  • $\begingroup$ rot13(V'z abg fher vs V fubhyq tb qbja gur Qhatrbaf naq Qentbaf be Qhaxva Qbahgf enoovg ubyr ) $\endgroup$ – GrumpyLlama59 Sep 19 '19 at 20:16
  • $\begingroup$ @GrumpyLlama59 Lrf, bqq nqqvgvbaf (53, 107, 69) ner QQ, rkprcg gur cnggrea oernxf sbe tnfbyvar, crgebyrhz, naq cbaqre (juvpu nqq gb 82, 125, naq 75 erfcrpgviryl) $\endgroup$ – marcellothearcane Sep 19 '19 at 20:20
  • $\begingroup$ @GrumpyLlama59 Qrsvavgryl qbahgf. $\endgroup$ – marcellothearcane Sep 19 '19 at 20:21
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A 'DD' Word is one which:

Contains a 3-letter sequence made of the initials of 3 consecutive months of the year, either forwards or backwards.

Since:

JAMJAR contains AMJ (April, May, June)
NOSTRIL contains NOS (November, October, September)
GASOLINE contains ASO (August, September, October)
JASPER contains JAS (July, August, September)
ENDNOTE contains DNO (December, November, October)
PONDER contains OND (October, November, December)
TRAMFUL contains AMF (April, March, February)

The counterexamples contain no such sequences.

Regarding the name:

'DD' is an abbreviation of sorts for 'dodeca-' (the Greek prefix meaning 'twelve') or 'duodecimal' (base 12) - both with connotations to 12, the number of months in a year.

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  • $\begingroup$ Very good! But not quite right on the reason for the name - I'm counting on you to think about it a bit more! $\endgroup$ – jackson h Sep 20 '19 at 13:42
  • $\begingroup$ @jacksonh Thanks - will update if I can think of anything else for the title... $\endgroup$ – Stiv Sep 20 '19 at 14:24
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    $\begingroup$ You are basically correct. The DD stands for (qhbqrpvzny) but I hadn't even thought about the other angle! $\endgroup$ – jackson h Sep 20 '19 at 19:06

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