Lag b'Omer
/lɑːɡ ˈbəʊmə
/noun
A Jewish festival held on the 33rd day of the Omer (the period between Passover and Pentecost), traditionally regarded as celebrating the end of a plague in the 2nd century.
Origin
From Hebrew lāḡ (pronunciation of the letters L (lamed) and G (gimel) symbolizing 33) + bā 'in the' + ‘ōmer (see omer).