X - implicit, extramental, not clear.
Perfect Man within the Cosmos is depicted with arms and legs outstretched in the shape of an X. As a point of power and the Roman numeral ten it suggests new beginnings or potential. It may also signify balance. If a cross appears in the shape of an X, this usually represents the idea of sacrifice or perhaps of torture. If an X appears in a dream, we are usually ?marking the spot?. It can also represent an error, a misjudgement or possibly something we particularly need to note. Written as a kiss it signifies unification of two entities. Also consult the entry for Cross in Shapes/Patterns.
An x—as in a check mark on a questionnaire or list—can mean your mind is focused on organizing, categorizing, or figuring something out (perhaps yourself or your life).