How to abbreviate Letter Box?

The ways to abbreviate Letter Box.

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1
LB:
Letter Box(Architectural, Architecture, Construction)
For more, try LETTER BOX on ALL ACRONYMS DICTIONARY
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APASmart Define. (2017). letter box. Retrieved September 21, 2026, from http://smartdefine.org/letter_box/abbreviations/a
ChicagoSmart Define. 2017. "letter box" http://smartdefine.org/letter_box/abbreviations/a (accessed September 21, 2026).
HarvardSmart Define 2017, letter box, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/letter_box/abbreviations/a>.
MLASmart Define. "letter box" 30 October 2017. Web. 21 September 2026. <http://smartdefine.org/letter_box/abbreviations/a>