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sd

Sd is a two-letter combination that appears in various fields and does not have a single, universal meaning.

In statistics, sd or SD stands for standard deviation, a measure of how spread out values in

In astronomy, sd is a prefix used to designate subdwarf stars, which are stars with lower luminosity

In computing and consumer electronics, SD most often refers to Secure Digital memory cards and the SD

Geographically and politically, SD is the ISO 3166-1 alpha-2 code for Sudan and is also the postal

In sports, particularly in Spanish-speaking countries, S.D. stands for Sociedad Deportiva, a designation used in the

Context determines the precise meaning of Sd, and its usage can vary across disciplines.

a
dataset
are
around
the
mean.
It
is
a
common
descriptor
of
variability
used
across
many
disciplines
to
understand
dispersion
in
data.
than
typical
main-sequence
stars
of
the
same
temperature.
Examples
include
sdB
and
sdO
stars,
types
of
hot
subdwarfs
that
occupy
a
distinct
place
in
stellar
classification.
card
standard.
These
cards
are
used
to
store
digital
data
in
cameras,
smartphones,
and
other
portable
devices,
and
they
come
in
various
formats
(SD,
SDHC,
SDXC)
with
different
capacities
and
speeds.
abbreviation
for
South
Dakota,
a
U.S.
state.
These
codes
appear
in
international
and
domestic
addressing,
datasets,
and
logistical
contexts.
names
of
football
and
other
sports
clubs.
It
signifies
the
organizational
form
of
a
sports
club
in
those
regions.