YΦXΨΩ were the letters added by the ancient greeks to the early northsemitic (phoenician) alphabet.

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SHAPE: A few different versions in ancient cities of the Western-Eastern greek alphabet groups. Two more frequent ancient shapes:
SOUNDS and LETTERINGS of [ks, x , ps]
Eastern group of cities used: Ψ for [ps] and X for [k^h]. (See Psi Ψ page). This is today's greek alphabet use.
Western group of cities used X for [ks] ΦΣ for [ps] and Ψ for [k^h]. This is X in today's latin alphabet use.
The X shape may be a transformation of theta: (rotation of the cross), or Tau T (which initially had a cross like form) or of Kappa K.

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SOUND: The X symbol was used by the eastern group of ancient greek cities for the sound [k^h] exactly like Θ [θ] started its life as [t^h]. The greeks loved this [h] sound after /p/ /t/ and /k/.
The swap from [k^h] to [x] sound happened after hellenistic times.
The palatal variation [ç] occurs before /i/ or /e/ sounds.

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NAME: ETYMOLOGY/SPELLING: (in polytonic script): ancient: χε hellenistic χ according to πε > π

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COMBINATIONS: none
DOUBLED: No double occurrences.

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MORE GREEK WORDS STARTING WITH X
•χάρτης= chart •χρόνoς= time - chrono(logy) •χρώμα=colour - chrom(atic) •χoλέρα= cholera •χιασμός= chiasmus