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    Glossary
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⎾x⏋

Definitions:

  The ceiling of x; the smallest integer ≥ x. For example,⎾5⏋= 5 and⎾5.2⏋= 6.
Sources:
NIST SP 800-135 Rev. 1
NIST SP 800-90A Rev. 1

  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.
Sources:
NIST SP 800-185

  The ceiling of x; the smallest integer \(\geq\) x. For example, \(\lceil\)5\(\rceil\) = 5 and \(\lceil\)5.3\(\rceil\) = 6.
Sources:
NIST SP 800-56B Rev. 2 under ┌x┐

  The smallest integer that is larger than or equal to X. The ceiling of X. For example, \(\lceil\)8.2\(\rceil\) = 9.
Sources:
NIST SP 800-108r1 [August 2022 (Includes updates as of 02-02-2024)] under \(\lceil\)X\(\rceil\)