One of the mysteries of the English language finally explained.
As a musical direction: go back or continue to the point indicated by the sign S.
Late 18th century. From Italian al segno, lit. ‘to the sign’ from al to the (from a to (from classical Latin ad, preposition: see ad-) + il, masculine definite article) + segno sign.
al segno/al ˈseɪnjəʊ//ɑːl ˈseɪnjəʊ//al ˈsɛnjəʊ/
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