A subset of the range of numeric values for combining classes— specifically, any value in the range 10..199.

• Fixed position classes are assigned to a small number of Hebrew, Arabic, Syriac, Telugu, Thai, Lao, and Tibetan combining marks whose positions were conceived of as occurring in a fixed position with respect to their grapheme base, regardless of any other combining mark that might also apply to the grapheme base.
• Not all Arabic vowel points or Indic matras are given fixed position classes. The existence of fixed position classes in the standard is an historical artefact of an earlier stage in its development, prior to the formal standardisation of the Unicode normalisation Forms.