These are used very often in math notations and so Unicode thought it would be good to have official text symbols for these characters.
Kuwani waxaa badanaa loo isticmaalaa sifafallada xisaabta, sidaa darteed Unicode waxay moodeysay inay fiicnaan laheyd inay lahaato calaamado qoraal rasmi ah oo loogu talagalay jilayaasha sheekaysigaan.