Conversation so far:
what is the repetition of a musical pattern is known as
An ostinato is a motif or phrase that persistently repeats in the same musical voice, frequently in the same pitch.
what is the symbol for the repetition in music
That which is to be repeated is generally included within the sign of two or four dots in the spaces.
does the number of repeat symbols make a difference
One repeat sign alone, means to repeat from the beginning, and then continue on (or stop, if the sign appears at the end of the piece).

Question: how are the symbols defined in unicode
Self-contained rewrite: how are musical repeat symbols defined in unicode