X-d

to cross out or mark with or as if with an x (often followed by out):
to x out an error.
to indicate choice, as on a ballot or examination (often followed by in):
to x in the candidate of your choice.
noun (pl) x’s, x’s, xs
the 24th letter and 19th consonant of the modern english alphabet
a speech sound sequence represented by this letter, in english pr-nounced as ks or gz or, in initial position, z, as in xylophone
symbol
(commerce, banking, finance) ex
(maths) the x-axis or a coordinate measured along the x-axis in a cartesian coordinate system
an algebraic variable
symbol
(formerly, in britain)

indicating a film that may not be publicly shown to anyone under 18. since 1982 replaced by symbol 18
(as modifier): an x film

denoting any unknown, unspecified, or variable factor, number, person, or thing
(on letters, cards, etc) denoting a kiss
(on ballot papers, etc) indicating choice
(on examination papers, etc) indicating error
for christ; christian
(roman numeral) ten see roman numerals
abscissa
by
times (that is, multiplication)
adult audiences only
christ
christian
experimental
extra
reactance
10