Arabic term (edited): ����

I've come across this term many times in human rights documents in English. It's not an abuse: it's a form of torture used in many Arab countries.
The normal way of dealing with this term in English is to transliterate it and then provide an explanatory translation; something along the lines of "beating the soles of the feet" should do.

http://www.amnesty.org/ailib/aireport/ar99/mde16.htm
falaqa (beating on the soles of the feet)

http://www.hrw.org/reports/2001/pa/isrpa1101-06.htm
falaqa, beating on the soles of the feet

http://www.hri.ca/fortherecord1999/vol2/libyatr.htm
Methods are said to include: beating, including falaqa (beatings on the soles of the feet)

Perhaps in a non-human rights rights context (this is the only context I have seen the term used in in English), you would not transliterate the term but just give an explanatory translation, but I doubt such a term would be used without reference to HR law.