Today's Arabic letter is "xaa" خ
xaa is the 7th letter in the Arabic Script and her English language equivalent is the consonant cluster "CH" as in "Loch Modan" or "Bach".
It is also pronounced at the back of the throat, but known as a "voiced fricative".
ح "Ha" was yesterday's letter.
خ "xaa" is today's letter.
د "daal" is tomorrow's letter.