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The least integer that is not less than the real number x.
NIST SP 800-38B
NIST SP 800-38C
NIST SP 800-38D
For a real number x, ⌈x⌉ is the least integer that is not strictly less than x. For example, ⌈3.2⌉ = 4, ⌈−3.2⌉ = −3, and ⌈6⌉=6.
NIST SP 800-185
The ceiling of x; the smallest integer ≥ x. For example,⎾5⏋= 5 and⎾5.2⏋= 6.
NIST SP 800-135 Rev. 1
NIST SP 800-90A Rev. 1
The ceiling of x; the smallest integer ≥ x. For example,⎾5⏋= 5 and⎾5.3⏋= 6.
NIST SP 800-56A Rev. 2
NIST SP 800-56B Rev. 1
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Also see Draft NISTIR 7298 Rev. 3 for additional details.