How to abbreviate Direct Distance Dialing?

The ways to abbreviate Direct Distance Dialing.

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DDD:
Direct Distance Dialing(Telecommunications, Technology)
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APASmart Define. (2017). direct distance dialing. Retrieved September 24, 2026, from http://smartdefine.org/direct_distance_dialing/abbreviations/a/technology
ChicagoSmart Define. 2017. "direct distance dialing" http://smartdefine.org/direct_distance_dialing/abbreviations/a/technology (accessed September 24, 2026).
HarvardSmart Define 2017, direct distance dialing, Smart Define, viewed 24 September, 2026, <http://smartdefine.org/direct_distance_dialing/abbreviations/a/technology>.
MLASmart Define. "direct distance dialing" 16 June 2017. Web. 24 September 2026. <http://smartdefine.org/direct_distance_dialing/abbreviations/a/technology>