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24/7, 24×7

Don’t use. Instead use 24 hours a day, seven days a week.

For more information, see Dates and times.

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2D

Abbreviation for two-dimensional. Spell out the first mention of the term as two-dimensional; on subsequent mentions, use 2D.

Always hyphenate two-dimensional. Don’t hyphenate the abbreviation as 2-D.

For more information, see Abbreviations.

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3D

Abbreviation for three-dimensional. Spell out the first mention of the term as three-dimensional; on subsequent mentions, use 3D.

Always hyphenate three-dimensional. Don’t hyphenate the abbreviation as 3-D.

For more information, see Abbreviations.

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