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MULT means it is a multiple-entry visa. From Annex VII of the Schengen Visa Code:
‘NUMBER OF ENTRIES’ heading:
This heading shows the number of times the visa holder may enter the territory for which the visa is valid, i.e. it refers to the number of periods of stay which may be spread over the entire period of validity, see 4.
The number of entries may be one, two or more. This number is written to the right-hand side of the preprinted part, using ‘01’, ‘02’ or the abbreviation ‘MULT’, where the visa authorises more than two entries.
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