The glyph is a canonical composition of the glyphs Glyph for U+0061Latin Small Letter A, Glyph for U+0306Combining Breve. It has no designated width in East Asian texts. In bidirectional text it is written from left to right. When changing direction it is not mirrored. The word that U+0103 forms with similar adjacent characters prevents a line break inside it. The glyph can be confused with one other glyph.
The Wikipedia has the following information about this codepoint:
Ă (upper case) or ă (lower case), usually referred to in English as A-breve, is a letter used in standard Romanian and Vietnamese orthographies. In Romanian, it is used to represent the mid-central unrounded vowel, while in Vietnamese it represents the short a sound. It is the second letter of the Romanian, Vietnamese, and the pre-1972 Malaysian alphabets, after A.
Ă/ă is also used in several languages for transliteration of the Bulgarian letter Ъ/ъ.