d
As D, the Roman numeral for 500, particularly in post-Roman use, derived graphically from the left half of the letter M (= thousand).
(Metric) As a lower-case prefix, d-, See deci-.
(Metric) Until 1960, as an upper-case prefix, D-, see deca-.
time SI d See day.
electromagnetics D See debye; see also Q factor for d as dissipation factor.
radiation physics As D, a unit of X-ray dosage, = 102 roentgen.
astronomy As D, see astronomical unit.
informatics In hexadecimal notation as D for 13, the 4th digit after 9.
biochemistry SI Unofficially but commonly D, see dalton (also Da).
See pitch.woodworking For sizes of nails, see pennysize.
